Until Feb. 28, 2007, members of Frontier Airlines EarlyReturns may redeem 7,500 miles for a non-stop roundtrip between Los Angeles (LAX) and San Francisco (SFO), provided they book their travel between before Feb. 28, 2007, and complete travel by May 31, 2007. This is half the usual amount of miles needed. Members are also being offered 4,500 bonus miles when completing three roundtrip flights between theses two airports from Nov. 1, 2006 to Feb. 28, 2007. A maximum of 18,000 bonus miles can be earned during this promotion. The 4,500 bonus miles are in addition to the 1,000 miles members earn for these flights for a total of 7,500 miles for three roundtrip flights. Members do not have to register for the bonus miles.