Check on the Internet for Credit Cards that give you air miles.  They usually give you enough for a free round-trip ticket just for signing up.  The United Visa and US Airways are two of note.  Southwest has a card.  There are credit cards that give you sky miles that can be used on most airlines.  Air Tran has two cards.  One has a $50 a year fee and gives you a free round-trip ticket.  As the ticket will cost much more than $50, this is the better deal.

If you funnel your finances through the card you may get a free ticket a year.  Often you can pay an annual fee of about $100 that'll double your air miles, getitng you free tickets in half the time.