It looks like the fare was correct!

This is a one-way fare with fare breakdown from ITA Matrix. It looks like this is really 2 fares in one - not a combined fare ticket. I mixed up a ticket with 2 airlines which can interline with a combined ticket. Looking at expert flyer, a combined ticket would be about this fare (except on a return basis), if one were to go via ORD or EWR on UA - except UA does not go to MYR - at least on the days I wish to travel. The booking code correspond to the flex fare on AC; the K fare is what I got on DL.

Well, for whatever is it worth; I will get lounge access in everywhere (except MYR where there are no lounges) - YOW at MLL, YYZ outbound at Premium Plaza lounge (I have a Canadian AMEX Platinum card; ATL in both directions- lounge in T5 as I have a Priority Pass card (I could go to a Delta lounge on the ATL-MYR flight, and pay the companion fee for my wife - whatever that fee may be?). I could potentially upgrade the AC flights.

I hope to upgrade for myself and my wife on the AC flights (with a tango fare, I could have upgraded - but even for a SE there is a co-pay - so how much would I have saved by upgrading a purchased tango fare on 4 AC segments?)

I really did not want to drive between ATL and MYR or between CLT and MYR.

I considered going via CLT to MYR on AA - but reasons I turned that down is the AC flight between YYZ and CLT is a one-cabin plane (one can not upgrade); and I had no options for lounge access in CLT (AA does not allow lounge access even for passengers from/to Canada flying business class-even if it was a business class ticket all the way); there would have been no lounge access at T3 in YYZ as AA flies from there, and there is no Plaza Premium lounge in transborder area of T3; and again, I would have no access to the AA lounge there.

Itinerary details
Itinerary

Ottawa (YOW) to Toronto (YYZ) — Fri, Nov 11
Air Canada 471
Dep: 5:45 am
Arr: 6:52 am
1h 7m
Airbus A320
Economy (G)

Toronto (YYZ) to Atlanta (ATL) — Fri, Nov 11
Air Canada 7540
Dep: 8:15 am
Arr: 10:30 am
2h 15m
Embraer RJ-175
Economy (G)
Food for Purchase
OPERATED BY AIR CANADA EXPRESS - SKY REGIONAL

Atlanta (ATL) to Myrtle Beach (MYR) — Fri, Nov 18
Delta 5236
Dep: 1:01 pm
Arr: 2:13 pm
1h 12m
Canadair Reg. Jet
Economy (K)
OPERATED BY EXPRESSJET DBA DELTA CONNECTION
Mileage
1,280 total miles
CO2 Emissions
373 kg (estimated by ITA).
Airport Information
Ottawa McDonald Cartier Int'l (YOW)
Toronto Lester B Pearson (YYZ)
Atlanta Hartsfield-Jackson International (ATL)
Myrtle Beach International (MYR)
Cost per passenger (including taxes & fees)
CA$704.22
Total cost for 1 passenger
CA$704.22
How to buy this ticket
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Provide this information to a travel agent to help them match the fares found.
Make sure to provide the exact booking and fare codes shown.
Fare for 1 adult
Fare 1: Carrier AC G21Q5TP YOW to ATL (rules)
Passenger type ADT, one-way fare, booking code G
Covers YOW-YYZ (Economy), YYZ-ATL (Economy)
CA$176.00
Fare 2: Carrier DL KAUNA0MQ ATL to MYR (rules)
Passenger type ADT, one-way fare, booking code K
Covers ATL-MYR (Economy)
CA$404.11
Canadian Goods and Services Tax (XG)
CA$29.61
Ottawa Airport Improvement Fee (SQ)
CA$23.00
Canadian Harmonized Sales Tax (ON) (RC)
CA$3.51
Canadian Air Travelers Security Charge (CA)
CA$12.10
USDA APHIS Fee (XA)
CA$5.20
US Immigration Fee (XY)
CA$9.10
US Customs Fee (YC)
CA$7.20
Toronto Airport Improvement Fee (SQ)
CA$4.00
US International Arrival Tax (US)
CA$23.20
US September 11th Security Fee (AY)
CA$7.30
Subtotal per passenger
CA$704.22
Number of passengers
x1
Subtotal For 1 adult
CA$704.22
This ticket is non-refundable.
Changes to this ticket will incur a penalty fee.
Fare Construction (can be useful to travel agents)
YOW AC X/YTO AC ATL 137.74G21Q5TP DL MYR 316.28KAUNA0MQ NUC 454.02 END ROE 1.277710 XT 12.10CA 3.51RC 27.00SQ 29.61XG 7.20YC 9.10XY 5.20XA 23.20US 7.30AY
Total Airfare & Taxes
CA$704.22
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