Airline stocks have taken flight as oil prices continue to fall. IBD’s airline industry group ranked No. 31 out of 197 in Tuesday’s edition, up from No. 111 just three weeks ago. This week, it’s been one of IBD’s 10 top-performing groups. The latest breakout was discounter Southwest Airlines (LUV). The stock’s base was a six-week cup with handle with a 35.45 buy point.