Airline executives say fares are based on supply and demand, not the cost of fuel, and the latest reports indicate that travel demand is holding up well.
However, American Airlines said Tuesday that it continued to expect unit revenue to fall by 6 percent to 8 percent in the first quarter. That mirrored a report late Monday from United Continental, which said lower average prices and a downturn in travel among people affected by the oil industry slump contributed to the drop in revenue for every seat flown one mile.
Both American and United have hubs in Texas.
— The Associated Press contributed to this article.