Spirit Airlines is out of business. That helps the two next-most vulnerable airlines, Frontier and JetBlue. Frontier is the other major ultra-low cost airline and the two competed on over 100 routes. JetBlue and Spirit were the major airlines in Fort Lauderdale, and JetBlue has already announced new routes there to take advantage of Spirit’s departure. But speculation about JetBlue’s future has been rampant. They’ve lost money for six years straight and they’re under a mountain of debt. Three weeks ago JetBlue founder Dave Neeleman warned that airline could go bankrupt this year and said that nobody would likely buy the whole thing (outside of chapter 11) because of the $9 billion they owe. There are a number of stories about an imminent bankruptcy filing by JetBlue, as fuel prices have surged during the conflict with Iran. That’s fake, and the excellent Jon Ostrower has seen someone pushing fake information on this for three weeks.…