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Yes—adding baggage after online check-in is often allowed via Manage Booking or at the airport, though cutoffs and fees differ by airline.

Yes — on KLM you can add baggage after booking via My Trip, online check-in, or at the airport; buying online up to 24 hours out often costs less.

Yes, you can add baggage after booking Aer Lingus—use Manage Trip or the app; online add-ons often cost less than paying at the airport.

Yes — JetBlue’s Blue Basic now includes one overhead carry-on plus a personal item, so you don’t need to pay extra to bring a carry-on bag.

Yes, you can add a carry-on on JetBlue Blue Basic: the fare now includes one overhead-bin bag plus one personal item, as long as both meet size rules.

Yes, a wheelchair can go on a plane: airlines carry manual or powered chairs, and you can ride an airport chair to the gate with trained assistance.

Yes, on Allegiant you can add a bag after check-in by using Manage Travel before printing a boarding pass, or at the airport counter for a higher fee.

No, a vape must stay out of checked bags; electronic smoking devices go in carry-on or on your person, with batteries protected and power off.

Yes, a UE Boom can go in checked luggage, but carrying the speaker in your cabin bag is wiser and spare lithium batteries must stay in carry-on.

Yes—most airlines let you add checked bags after booking through Manage Booking or the app, usually up to a few hours before departure.