Hi fellow FTers!
I'm working on updated for the new roll out of Comfort + (C+)
Thanks!
rwoman

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On March 1, 2015, DL rebranded Economy Comfort as "Comfort+."
Delta - Comfort+
dl.com: LINK
Comfort+ FAQ - LINK
Offering:

• C+ is a complimentary upgrade (space available) for DM and PM after booking. GM can access for free at T-72 and FO at T-24. (There is no longer a discount for GM/FO.)
• Sky Priority boarding
• Extra legroom and, on international a/c, extra recline
• Free wine, spirits and regional craft beers, plus premium snacks
• Complimentary premium entertainment from Delta Studio™ (No longer relevant as of July 1st; Entertainment now complimentary in Y)
• On JFK-LAX/SFO flights, a Luvo® sandwich wrap and frozen Greek yogurt bar, pillow, blanket, and sleep kit are included

A few general notes regarding DL C+:

1. On international a/c, the bulkhead seats often have a significant amount leg room (other than the 764).
2. The bulkhead and exit row seats are often narrower as the tray table and/or IFE unit are in the arm rests. The arm rests do not move which, coupled with a smaller seat, can be uncomfortable for larger pax.
3. The first row of regular economy seating after EC IS NOT recommended. The last row of EC has the EC recline and members have reported that there's no extra space between this row and the first row of regular Y.
4. Selecting C+ Seats - You cannot select or purchase C+ seats until after booking is completed on revenue or award tickets. The UG has to clear as well.

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Internationally Configured Aircraft
Per DL, International/transoceanic C+ offers 35" pitch and 6" recline. (LINK)

747-400 / 744 / 74S:

• dl.com seat map: 747-400
  Rows 22-26 - 42 total C+ seats.
• Legroom:
  Row 22 ABC/HJK and 24 DEFG are the bulkhead seats. 22C/H are noted as having unlimited legroom and some have noted that people can congregate due to the proximity of the lavatories, which are located directly in front of the first row of C+ on the 744. 22ABC have recently received poor reviews because of the lav and galley - people tend to congregate in this area and it can become stinky. Comments on 22K indicate that pax can access the aisle without disturbing other passengers. Also, the lavatory near 22HJK is blocked for BusinessElite pax, so there tends to be fewer disturbances and become less smelly over the course of a long flight. Also, seats 22B and 22J can be used for bassinets.
  Some might prefer the legroom of row 35/51 on the 744 with less recline and tray in armrest.
• Related Threads and Posts:
  EC Bulkheads on the 74S
  Economy Comfort on 747-400
  The Official Delta 747-400 Interior Mod Tracking Thread
  tentseller's review of the 744 - LINK
  Comments on seat power on the 74S - LINK

777-200LR / 777-200ER / 772

• dl.com seat maps: 777-200LR / 777-200ER
  Rows 31-34; 36 C+ seats
  NOTE: As DL reduced the number of Business Elite seats on the 777s, rows 29-32 are now the C+ seats.
  The C+/Economy seats on a/c has winged headrests.
• Legroom:
  Row 29/31 seats are the bulkhead seats and have plenty of leg room. Rows 30-32/32-34 are standard C+ seats with USB and plug power. Row 44 (exit row) has excellent legroom, but no power outlets. The window seat sin this row are narrower because the tray table is in the armrest does not move up. The recline is standard recline.
  IFE:
  These a/c are equipped with IFE at each seat.
• Related Threads and Posts:
  Recent comments on row 31 and row 29 (Bulkhead C+ seats): Delta 777 Bulkhead Seat
  chimphappyhour's feedback on a 777 flight LAX-SYD-LAX in EC - LINK.
  Thoughts on Row 31 - LINK
  modhop's video of the 777 - LINK
  My thoughts on row 35, the first row of Y after EC - LINK
  My pictures of row 31 - LINK
  777-200LR Economy Comfort & exit row questions

A330-300 / A333:

• dl.com seat maps: A333 / A3L3
  • A333: C+ is rows 10-14
    NOTE: All of the A330-300s have been modified or are in the process of being modified.
• Legroom:
  • A333 - 10 AB and 10HJ have a bulkhead/galley in front of them.
• IFE:
  These a/c are equipped with IFE at each seat.
• Related Threads and Posts:
  JulienMSP's comments on A330 EC: http://www.flyertalk.com/forum/delta...der-767-a.html
  The Official Delta A330 Interior Mod Tracking Thread
  Economy Comfort on A330-300s?
  Master A330-300 (A333) Best Seats Thread [Merged Threads]
  tentseller's review of the A333 - LINK.
  kpfleming's thoughts on EC (dis)comfort (A333) - LINK
  rwoman's picture of 10J (A333) - LINK
  c_d's pictures of 11J and the entertainment box that impedes legroom (A333) - LINK
  Any *recent* reports of EC on the A333?

A330-200 / A332:

• dl.com seat maps: A332 / A3L2
  • A332: C+ is rows 10-13
• Legroom:
  • A332 - Row 10 and row 11 C/G have ample legroom.
  • A3L2 - Row 10 is the bulkhead row. The J cabin is on the other side of the bulkhead.
• IFE:
  These a/c are equipped with IFE at each seat.
• Related Threads and Posts:
  nabilm92's Trip Report on the A332, including row 10 HJ and pics of EC - http://www.flyertalk.com/forum/trip-...e-sea-hkg.html
  The Official Delta A330 Interior Mod Tracking Thread
  Any *recent* reports of EC on the A333?
  c_d's pictures of 11D and 11F and the entertainment boxes that impede legroom (A332) - LINK; comments on 11D and 11F (A332) - LINK
  CarmenOM's comments on 11C and 11G, which have excellent leg room and row 10. Also row 11 has moveable armrests across the row (A332) - LINK

767-400 / 764 / 76D:

• dl.com seat map: LINK
  C+ is rows 15-18
• Legroom:
  On the 764, the bulkhead seats (row 15) have less leg room than the 763's; there's probably about 2' or so between the edge of the seat and the wall. The bulkhead seats do not have moveable arm rests and the tray table/IFE monitor are in the arm rests. In my experience, I felt like the A332/333 and 763's had better recline in EC than the 764.
• IFE:
  These a/c are equipped with IFE at each seat.
  Note: The overhead bins above 16 CDE have emergency equipment in them and cannot be used for stowage of luggage.
• Related Threads and Posts:
  Discussion on 17E vs. 18F: LINK
  mgoflyer's negative thoughts on 15G - LINK
  tentseller's thoughts on row 15 - LINK
  NecessaryIndulgence's thoughts on row 15 - LINK
  My pictures of Row 15: 15E: LINK; Space between Row 15 and the bulkhead - LINK
  My pictures comparing Row 15, "regular" EC, and normal Y seats - LINK
  My pictures of 18F with 17F fully reclined - LINK
  The London FAQ also includes many comments on the 764 - FAQ: Flying to London on DL

767-300ER - 76Z (v1 and v2) / 76L (previously seen as 76W) / 76T

• dl.com: 76Z v1; 76Z v2; 76L; 76T
  • 76Z v1 - Rows 13-15 AB CDE FG and 16-17 AB FG
  • 76Z v2 - Rows 12-16
  • 76L - Rows 16-21
  • 76T - Rows 17-21
• IFE:
  These a/c are equipped with IFE at each seat. There is also USB power and standard plugs.
• Legroom:
  The bulkhead seats do not have moveable arm rests. On 763's with row 20 and 21 as EC seats, note these are both exit rows and seats recline in both rows.
• Related Threads and Posts:
  rwoman's pics of seats 13 FG on the 76Z v1 - LINK
  gooslee's comments on the 76L - LINK
  CarmenOM's comments on the 76L - LINK
  Y29M's comments on the 763 row 17 (76T) - LINK
  rwoman's thoughts on the modified 76 (76T) - LINK
  53flyer's comments on the modified763 row 17 and the impact on legroom (76T) - LINK
  rwoman's comments on the exit rows (76L and 76T) - LINK
  garyfam's comments on the exit rows (76L and 76T) - LINK
  Seat 1A's photos of 17E (EC Bulkhead - 76T) and row 22CDE (regular Y bulkhead) (76L / 76T) - LINK
  CosmoHuman's comments on the outside first row (12AB and 12FG) on the 76Z v2 LINK
  TrojanTraveler's comments on the protruding exit doors on 12A and 12G on 76Z v2 LINK
  RaflW's comments on 16AB and other nearby seats with pics for the 76Z v2 LINK

757-200 (Delta One Equipped) - 75S:

• dl.com - 757-200 (75S)
  44 C+ Seats - Rows 18-25
  NOTE: There is a slide on the exit row door in front of 19A that can impede legroom. There is no window at row 22.
• Legroom: Rows 19 and 18 are the bulkhead seats.
• IFE: All Y seats have AVOD. Movies are complimentary in EC
• Related Posts and Threads:
  757-200 Interior Mod Tracking Thread
  757s
  When will the transcon 757-200 BE lie flat's be ready?

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Domestic Configured Aircraft
Per DL, domestic Comfort + offers a minimum 34" pitch and normal recline. (LINK)

767-300 / 76P / 76Q

• dl.com: 767-300 (76Q/P)
  C+ is rows 10-14
• Legroom: Row 10 has a hard bulkhead in front of it, but the legroom is still decent. This row has an immoveable armrest and the tray table is in the armrest as well.
• Related Threads and Posts:
  gooselee's comments on row 10 - LINK

757-300 / 753:

• dl.com: 757-300 / 753
  C+ is rows 14-18
• IFE:
  This a/c has PTVs and ISP
• Legroom:
  No additional comments
• Related Threads and Posts for the 753s:
  The Official Delta 757-300 Interior Mod Tracking Thread
  lamont2718's feedback regarding restricted legroom in 16DEF: LINK
  14A/B on the 757-300
  757-300 seat 14A any good?

757-200 / 757 / 75D(H)/ 75X:
Domestic 757's are referenced below. Discussion on the non-PTV 752's - LINK.

• 757/75U:
  • dl.com: 757-200 / 75U
    C+ is rows 21-23 ABC and 19-22 DEF.
  • IFE:
    This a/c has overhead screens.
  • Related Threads and Posts:
    Why no EC Seat in bulkhead of 757? Can't find answer on seat guru
• 75D/H:
  • dl.com: 757-200 / 75D(H)
    C+ is rows 15-20 ABC and 15-16; 18-20 DEF
  • IFE:
    This a/c has AVOD and ISP
  • Related Threads and Posts:
    None
• 75G:
  • dl.com: 757-200 / 75G
  • IFE:
    None
  • Related Threads and Posts:
    None
• 75X:
  • dl.com: 757-200 / 75X
    EC is rows 20-23 ABC and 19-23 DEF
  • IFE:
    This a/c has PTVs and power ports.
  • Related Threads and Posts:
    http://www.flyertalk.com/forum/delta...tter-seat.html
    75X Y exit row best
    Every1 Get A Life's feedback on the 75X overwing exits - LINK
    gooslee's feedback on PTV equipped 75X's - LINK and LINK
    gooselee's feedback on row 23 on the 75X - LINK

737-900ER / 739

• dl.com: 737-900ER / 739
  C+ is rows 10-13 ABC and 11-13 DEF.
• IFE:
  This a/c has PTVs and power.
• Legroom:
  The general feedback is 10C and 11D may be the best seats. Overall feedback is not great.
• Related Threads and Posts:
  twnwz's experience on the 739: LINK
  Best seat on 737-900ER?

737-800 / 738 / 73H:

• 737-800 / 738:
  • dl.com:
  • 737-800 / 738
    C+ is rows 10-15
  • IFE:
    This a/c has overhead video.
  • Legroom:
    Row 10 has standard bulkhead legroom for an economy bulkhead, making it challenging to get out from the window seat.
  • Related Threads and Posts:
    T.J. Bender's negative feedback on the 737 Row 10 - LINK
    cardood's thoughts on the 737 Row 10 - LINK
    CBear's comments on using a rear facing car seat - LINK
    lhitchner's feedback on the 737 Row 10 - LINK

• 737-800 / 73H:
  • dl.com: 737-800 - 73H
    C+ is rows 10-12.
  • IFE:
    This a/c has PTVs.
  • Legroom:
    Row 10 has standard bulkhead legroom for an economy bulkhead, making it challenging to get out from the window seat.
  • Related Threads and Comments:
    None

737-700 / 73W:

• dl.com: 737-700 / 73W
  C+ is rows 10-12.
• IFE:
  This a/c has PTVs.
• Legroom:
  Row 10 has good legroom. It is directly behind the F cabin and there is no fixed bulkhead, allowing pax in row 10 to store items underneath row 3.
• Related Threads and Posts:
  rwoman's pics of the 73W Row 10 - LINK

MD-88 / M88:

• dl.com: MD-88 / M88
  C+ is rows 10-14
• IFE:
  None
• Legroom:
  Row 10 has very good legroom.
• Related Threads and Posts:
  javabytes' post on row 11 - LINK
  Bicostal's feedback on row 10 - LINK
  rwoman's pics of row 10 - LINK

MD-90 / M90

• dl.com: M-90 / M90
  C+ is rows 10-14.
• IFE:
  This a/c is equipped with ISP in rows 10-12 only
• Legroom:
  There is a soft wall in front of row 10. 10C is not necessarily recommended due to the aisle shift between the F and Y cabins. Reviews of room for row 13, the first regular row of Y have been acceptable.
• Related Threads and Posts:
  Misconfigured C+ seating on certain MD-90 aircraft
  Seat 10C on the MD-90 - why does it even exist??
  MD-90 Aircraft: The Definitive Thread
  MD-90 Economy bulkhead

717:

• dl.com: 717
  C+ is Rows 10-12
• IFE:
  None
• Legroom:
  
• Related Threads and Posts:
  Boeing 717: The Definitive Thread
  mattp1987's photos of the 717 - LINK

A321-200:

• dl.com: A321
  C+ is rows 10-14
• IFE:
  PTVs and Delta Studio via wifi
• Legroom:
  RaflW's post on the 321 C+ cabin
• Related threads and posts:
  None

A320-200 / 32R:

• dl.com: A320/32R
  C+ is rows 4-6
• IFE:
  None
• Legroom:
  No additional comments

A320-200/32K

• dl.com: A320 / 32K
  C+ is rows 10-12
• IFE:
  None
• Legroom:
  No additional comments
• Related threads and posts:
  None

A319-100/319

• dl.com: A319 / 319
  C+ is rows 4-6
• IFE:
  None
• Legroom:
  No additional comments
• Related Threads and posts:
  akonrandi's comments on A319/A320 seats - LINK.

A319-100/31J

• dl.com: A319 / 31J
  C+ is rows 10-12
• IFE:
  This a/c is equipped with AVOD
• Legroom:
  No additional comments
• Related Threads and posts:
  None

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Flying to Hawaii in C+:
- From DL's C+ page: 3-4" (7-10 cm) extra legroom/ Up to 50% more recline on select routes (JFK to/from SFO or LAX, and ATL/MSP/or JFK to/from HNL).

Related threads and posts:
http://www.flyertalk.com/forum/delta...767-300er.html

C+ and Priority Boarding/Baggage Allowance:
Passengers in C+ get Sky Priority boarding unless their elite status provides a higher boarding zonemu access. There is no additional baggage allowance unless elite status or fare class provide it.

Related threads and posts:
jamersteroh's comments on zone 1: LINK
jamersteroh's comments on baggage: LINK

Status Changes:
There have been a couple of questions regarding C+ when a member's status drops down after January 31. Typically, seats will hold unless there is an equipment change. If there's a change, the passenger(s) will most likely be seated in regular economy. There are reports of some success contacting @delta to get reseated in C+.

Related threads:
http://www.flyertalk.com/forum/delta...-ec-seats.html
http://www.flyertalk.com/forum/delta...op-silver.html

Threads/posts that may be useful for non-C+ information:
http://www.flyertalk.com/forum/delta...-aircraft.html
Delta Preferred seating: LINK

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KLM - Economy Comfort

klm.com: LINK
Related FT Threads:
KLM New no Economy Comfort on DL-coded before check-in
DL.com won't let me select seats on KLM flight
KLM Seating, Including Economy Comfort
Delta.com Says KLM Economy Comfort is Free for Delta PMs, But it's Not True