1: If I've paid on a non budget airlines _site_ (like Lufthansa,Air France,SAS,etc) and then see another livery on the plane I'm boarding that I'm not expecting I'd be slightly disappointed and lose trust in the selling airline regardless of any codeshare. If I see when ordering on the SAS site that the second leg on a route is handled by Lufthansa I'm not gonna worry.

2: Baggage allowance is clearly stated when ordering tickets online from a serious airline (because they love to show low prices for no checked in baggage and scrounge you for any extras).

3: I was actually wondering about that on a recent flight so I kept an eye on details and the baggage tag receipt I got clearly stated the route I was flying so I knew the baggage would end up where needed.

4: Bonus program points are usually stated when ordering.

5: The US should just follow the EU lead and harmonize rules a bit (maybe there's already some basic rules in place?), EC 261 has codified some basic rules to alleviate traveler worries in terms of responsibilities when it comes to delays and cancellations. (1)

It's 2024 and we really don't need to pile on bad cludges upon 1960s solutions to keep things working.

And yes, yesterday or today might've been the time to start a process to extent the flight code system within a 20 year horizon, but to extend it in a hurry because of airlines duplicating crap with codeshares is just silly.

Honestly codeshares suck regardless. If I chose an airline it’s because I did not want to deal with their annoying competitors.