Spirit Airlines' quarterly profit more than doubled as the low-cost airline earned more from non-ticket sources of revenue.
Spirit's second-quarter net income rose to USD$34.6 million, from USD$16.9 million a year earlier.
Operating revenue jumped 26 percent to USD$346.3 million.
Revenue from non-ticket sources such as checked and carry-on bags rose about 42 percent to USD$134.5 million.
Revenue per available seat mile rose 8 percent to 12.25 cents.