how to book DL segment by segment?
 

Is there a website that allows for the selection of flights per segment as part of a multi-segment itinerary?

for example:
LAX-ATL Z (on 772)
ATL-NAS Z

DL.com now won’t even present flights when using multi-segment
Expedia multi-segment same as DL.com
AMEX/Chase portals now Expedia engine.
Kayak same as DL.com.
Google Flights prices in D for DL.com link but shows the Z price as says “use a travel agent”.

Some luck with Priceline. I can select from a subset of flights per segment, but the desired 77W is not one of them.

Any other ideas?

you can call them and ask them to sell you the ticket point to point. they should be able to do that over the phone. good luck.

Have you tried https://matrix.itasoftware.com and then https://bookwithmatrix.com? What dates are you looking at?

looking to book this at $442
https://www.google.com/flights/#flt=...190*.USD.44190

BookWithMatrix showing $830, same at DL.com

I am suspicious that even a travel agent can't book this because I called AMEX Platinum Travel, who priced it at $830 (less a small IAP discount).
Suspect a married-segment issue that's wiping out the Z inventory.

ITA Matrix has issues with married segment logic when using multi-city searches. It incorrectly looks at individual flight fare buckets, rather than the married buckets when quoting fares. If you check on ExpertFlyer, you will see there is only D inventory only July 4th and no Z when the flights are married together. Google uses the same code, but does a final check on inventory at the end and discovers that there is no Z available. Google is wrong to suggest that an agent can book this. Agents can't override the married segment bucket inventory set by the airline.

DL1129 J9 C9 D7 I0 Z0 W9 Y9 B9 M9 H9 Q9 K9 L9 U9 T9 X4 V0 E9
DL337 J9 C9 D6 I0 Z0 W9 Y9 B9 M9 H9 Q9 K9 L9 U9 T9 X9 V0 E9

There have been several threads here on this issue.

Married segment non-availability?

Just call DL. There is no telephone fee.

There's nothing to call about. There's quite simply no Z inventory (see above for actual inventory from EF). I know it may be hard to believe that ITA/Google code may have bugs, but it's a fact. Again, it's only with the multi-city searches. If you do a simple one-way search on LAX-NAS, it get's it right and see's there is only D bucket inventory on a married segment basis on the route. It's when you do the multi-city search where it screws up and incorrectly looks at the bucket availability flight by flight, rather than on a married segment basis. The $442 fare being quoted is a real Z fare, but it's a LAX-NAS fare (not a combination of LAX-ATL and ATL-NAS fares). Threre's just no actual Z bucket availability on a married segment basis. Think about it for two seconds. Do you really believe there's some combo of two Z fares on that routing that adds up to $442?? Of course not. The cheapest Z fares on LAX-ATL are $579 and they aren't even available on flights in the 6AM - noon window due to time-of-day/day-of-week restrictions.

I had a similar situation not too terribly long ago when a "standard" routing to Athens from my home airport ran $2400 (Home - DTW - JFK - ATH) but going via ORD (ORD - JFK - ATH) was like $900 and Home to ORD (via DTW) was like $300. When I tried to put the whole thing on one PNR, the price immediately went to $2400, but on separate PNRs they honored the $900/300. Checking in at my home airport I had them look up both itineraries (it was all Delta metal) and they were able to check my bags all the way through. On paper, it was 2 trips, but I only had to check bags once and clear security once.

Having said that, I haaaaated going that route. If anything had gone sideways on the trip from home to ORD, I'd have been treated as a no-show for the ORD-ATH portion, and that would have been Very Bad. The only reason I even tried it was I had a long (3+ hour) layover at ORD and I knew that if things got really desperate, I had time to rent a car and drive from DTW to ORD if needed. Everything went off without a hitch, but I was nervous until I hit ORD.

Not the same at all. You changed the routing and took advantage of the cheaper fares out of a competitive market (ORD) vs. an un-competitive hub-hostage market (DTW). Once again, the fare being quoted to OP is NOT a broken fare. There are no broken fare combinations that would give you a $442 fare. It's a simple through fare for LAX-NAS (fare basis code XNNJ0NFX), but unfortunately, one for which there is no actual Z bucket availability. There is Z bucket on the individual flights, but not on the married segments which is all that matters when quoting LAX-NAS through fares.

Note that there is Z bucket available on flights 377, 337 when married. So OP just has to take the 8:05AM flight instead of the 9:30AM flight to ATL to get the $442 fare.

Minor side note.

From all reports DL treats split ticket passengers on DL<>DL flights that miss-connect as they would treat those WX IROP'd on a single ticket (assuming your tickets meet MCT). Though you are correct that DL does not contractually owe you on the miss-connect and would be within legal rights to tell you "so sorry".

It wouldn't have been very bad and you had no reason to be nervous.

Delta will protect across two tickets, as long as they are both DL tickets and the cause of the delay is on DL, weather, or ATC (aka out of the customer's control).