But do they hold the fare for you while you make the drive to the airport?

I would hate to be counting on a $220. round trip U fare and when I get to the airport all the U seats are gone and I have to pay $350. for M class seats.

Travel tips:
http://members.aol.com/ajaynejr/travel.htm

Took four Delta segments so far this year. Tried to volunteer on all of them and did not succeed in getting any voucher at all.