Spirit stole the title from Alaska Airlines, which is currently the second-best earning airline, taking in an 11.3% profit.
And despite having the lowest amount of total shares at $5.63 billion, Spirit still beats out the likes of other budget airlines like JetBlue, which is making a 6.9% profit, and Southwest Airlines, which collects a mere 6.1%. Even larger carriers like American Airlines (which makes a 6.8% profit), United Airlines (2.9%), and Delta Air Lines (2.9%) are making less of a return on their services. But, it's Spirit. You practically have to pay for the air you breathe.