As Tropical Storm Isaac heads toward land, the major airports in the path have all their planes grounded. That leaves a bunch of passengers looking to rebook their missed flights.

The good news is that all of the airlines have waived their rebooking fees due to the severe weather. That is a big plus since these fees can be as high as $150.

While it is a big relief that the airlines waive this fee, the time you have to get on your new flight varies from carrier to carrier. Some airlines are giving passengers nearly a year to fly while others are requiring passengers to be on planes as soon as Friday.

Your best bet is to make sure you know your airline's policy before you reschedule. Don't hesitate to contact your carrier now so you know what's going to happen to your flight after the storm.