Airline change fees can be confusing—especially now, as widespread travel is restarting. During the pandemic, several major U.S. airlines dropped change fees for good in the majority of fare classes for most flights originating in North America. But that doesn’t mean all fares and carriers offer the same flexible policies. (Hint: If you’ve booked a basic economy fare, the rules are much more restrictive.)

It’s important to note that in special circumstances, like a storm or other foreseen situations that could interfere with travel, airlines may issue a travel waiver allowing fee-free changes for all fare classes on certain affected routes. (Many airlines had waivers for COVID-19, but most are coming to an end.) In those instances, it’s worth checking your airline’s website for such a waiver before you rebook.

Something else to keep in mind: the Department of Transportation’s 24-hour cancellation rule. This federal regulation that applies to all flights booked at least a week before the departure date. The rule stipulates that airlines operating within the U.S. must allow travelers hold a reservation at the quoted fare for 24 hours without payment, or allow a purchased reservation to be canceled within 24 hours without penalty and with a full refund to the original form of payment.

Here’s a rundown of all U.S. airline change fees, so you can plan accordingly.

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