It's also possible to enter by mail, without making a purchase.
You may also enter the Sweepstakes by hand-printing your complete name and address, phone number and Delta SkyMiles number on a 3" x 5" piece of paper. Mail your entry in a hand-addressed, postage-paid, (#10) envelope to: Delta "Tickets For Life" 2007 Sweepstakes, P.O. Box 6727, West Caldwell, NJ 07007-6727. To be eligible for a Daily Prize, Mail-In entries must be received by 12/24/07.