Tip - What Should I Do When My Flight Gets Cancelled?

Dear Lifehacker, I'll be traveling a lot for the holidays, but I've had some pretty bad experiences in the past with flights getting delayed or cancelled. I've followed your guide to stress-free travel, but what can I do when the unexpected happens and my flight gets cancelled?
Tags: Ask Lifehacker, Travel, Flights, Hotels, Annoyances, Vacation, Holidays, Weather, air travel, Top, Lifehacker