Southwest Airlines, the world’s all-time most successful airline, is under siege. The take-no-prisoners activist investor Paul Singer and his Elliott Management firm want to oust the top ...

Some called him "the high priest of ha-ha"; to Ryanair boss Michael O'Leary, he was "the Grand Master Yoda of the low-fare airlines". But there's a case to be made that Herb Kelleher, who died ...