Yes, through passengers can move to any available seat after non-through passengers deplane. As A1 you still got your choice of seat before A2 and everyone else boarding at your place of departure so there is still a benefit to the upgraded boarding position. In this particular case your expectations were just different than what the actual situation was. --TheMiddleSeat
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If your flight is cancelled and you are at home, usually you’ll get either text/email/call alerts based on your preferences. There is usually a link to go online and rebook yourself, which is the easiest way to find a new flight. You also won’t have to go to the airport. If there aren’t any acceptable flights, try researching other nearby airports to see if you can get a flight out of there. While you might not be able to book it online without fees, you can call the reservations line and they’ll likely waive any change/fare differences to accommodate you. If you are already at the airport, it’s probably best to go and talk with customer service face to face. They can usually offer the most help looking up alternative options or flights out of nearby airports. If you checked a bag and are in the terminal, you’ll want to work out where you need to go to retrieve it too. Calling reservations over the phone is an option too, but you can expect longer waits if there are a lot of cancellations. That’s why I prefer the above options to just calling them directly. Plus if you can scope out what is available online, you can have a better idea of what your options are before you talk to someone.
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