A friend of mine booked a flight, via aa.com, to London on September 13. AA6236, operated by British Airways. They're traveling to Paris, via train, to Naples, via an expedia.com booked flight and then to Rome via train. They're then flying out of Rome on September 23 via AA721 (FCO->CLT) and AA2577 (CLT->AUS). Total flight time for the return trip: 15h 20m. They paid $1,208.96.
I'm now trying to book a similar flight. I want to fly into Naples on September 18, meet my friend and then fly out of Rome with them on September 23. Only problem: I'm not being presented with the same return trip flight options that they had.
For $1,623.66 I can purchase a multi-city flight that flies out of Rome on September 23 via AA6751 (FCO->LHR) and AA6237 (LHR->AUS). Total flight time for the return trip: 32h 10m. The return flight is totally different.
For $3,106.66 I can purchase a multi-city flight that flies out of Rome on September 23 via AA111 (FCO->ORD) and AA2995 (ORD->AUS). Total flight time: 15h 32m. The flight time of the return trip is much better but the cost is a lot more. A lot of the appeal of my friends booking is that it was both cheap and (relatively) fast.
I just don't understand why I'm not being presented with the same options.

