GoGo the last time I flew was like $13 ....
But, that was per flight, so if you had a trip with connecting flights that changed planes, you would be charge for the 2nd flight as well ..
If they really wanted to do it right, they'd charge the $13 for a 24 hour period ... I would possibly go for that ... unfortunately I always have to use more than 1 airline as no one goes the route I need.