US carriers Continental Airlines and Southwest Airlines have both reported higher revenues thanks to increased passenger numbers and ticket prices.
Both Continental and Southwest have seen a rise in passengers
Continental's third-quarter revenues rose 17% to $3.5bn (£1.9bn), compared to $3bn a year earlier.
Revenues at Southwest for the same three months until the end of September increased by 18% to $2.3bn.
Yet while profits at Continental almost quadrupled, Southwest blamed a decline on higher security costs.
Continental Airlines made a third-quarter net profit of $237m, compared with $61m a year earlier, boosted by the sale of a stake in a South American carrier.
Excluding the sale of its share in Copa Airlines, Continental said its profit would have been $146m.
Excluding one-off charges and an accounting change, Southwest's net income fell to $154m from $210m for the same time last year.
It blamed the fall on increased security measures following the alleged plot to attack planes in the UK in the summer.
Passenger numbers at Continental were up 9.1%, while those at Southwest increased 4.5%.