For some budget travelers, Spirit Airlines was more than the punchline of a joke about ultra-low-fare airline options — it was the only option, travel pros tell Axios. The big picture: The grounding of the low-cost carrier comes amid an affordability crisis that's left Americans with a bleak outlook on personal finances. The company's demise is predicted to lead to an uptick in ticket prices when travelers are already grappling with the Iran war driving up car and jet fuel prices. "What a sad e