Yes, you can make changes to your flight up until 10 minutes before scheduled departure time, even if you've already checked in. If you're changing to a flight within 24 hours, be sure to check in for your new flight after you make the change.
What happens if your flight is Cancelled after check in?
Ask for a refund or replacement at the airport if you can. If not, you can claim from the airline later. You also have a legal right to: help with costs – if the cancellation delays you 2 or more hours.
What happens if you check in for a flight but don’t go?
If you have already checked in and cannot make the flight, you will be treated as a “No Show” and will lose the entire amount paid by you for the ticket. If you have checked in and decide not to fly, you should cancel your ticket to receive some refund, depending on which type of booking you have done.
Can I check in and then cancel my flight?
How do you uncheck in for a flight?
Some airlines offer service portals on their travel agent websites to uncheck the passengers. If those options are not available to you, simply calling the airline is your best course of action. They can uncheck the passengers for you upon request.
How do I change my seat after checking in?
You may change/ upgrade your seat selection up to 4 hours prior to the scheduled time of departure. Such changes can be made via Purchases, during your web check in/ Mobile check in or even over the airport check in counter. Just a friendly reminder, a seat change will incur an additional fee, so plan ahead!
Can you request to get off a plane after boarding?
As long as there's time till the door closes, it's generally no problem. Especially if they're sitting up front so it's easy to get off. I'd about guarantee that the FA noticed who they were and made sure they re-boarded though. If they didn't re-board, there's a potential security problem.