1번 관련해서 tripadvisor에 first marketing carrier 규정에 대한 상세 내용이 있네요.

“For example, Alaska Airlines only flies regionally and has no free baggage allowance. Yet Alaska also provides domestic connecting flights for other airlines’ long haul services. As they don’t want to constrain passengers to their baggage fees for all flights Alaska applies the baggage allowance and fees of the most significant carrier whose flight number is on the ticket, and that allowance applies for all flights. So if you start with an Alaska (AS) flight connecting to a Korean Airlines (KL) flight, Alaska will give you Korean’s baggage allowance (2 free bags for US originating flights) and that allowance is then the same (2 free bags) for all other flights on the ticket.“