I always check out expedia and travelocity and all those discount flights and then go directly to the airline sites to see if they can beat them. Spirit is a good one for cheap deals. Get on their e-mail list. Also Travelzoo.com.

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Life's just a crazy ride on a run away train
You can't go back for what you've missed
So make it count, hold on tight find a way to make it right
You only get one trip
So make it good, make it last 'cause it all flies by so fast
You only get one trip