Peter Greenberg has the who and whyPHOTO: FORT LAUDERDALE, FLORIDA - MAY 16: A Frontier Airlines plane near a Spirit Airlines plane at the Fort Lauderdale-Hollywood International Airport on May 16, 2022 in Fort Lauderdale, Florida. JetBlue announced it is taking a hostile position in its effort to acquire Spirit Airlines. Spirit previously rejected a takeover offer from JetBlue, favoring an earlier deal to merge with Frontier airlines. (Photo by Joe Raedle/Getty Images)