Southwest Airlines Rapid Rewards Points Will No Longer Expire Southwest Airlines announced significant changes to its Rapid Rewards frequent-flyer program. In a major shift, the airline said the its Rapid Rewards award miles will never expire. The move follows a similar announcement by United Airlines at the end of August. United had been the first to award members miles that did expire, starting in 1989, a concept that eventually became the industry standard.  Delta Air Lines was the first to offer…