United Airlines and smaller JetBlue Airways on Thursday asked the U.S. Transportation Department to reject a complaint filed by Spirit Airlines to their proposed partnership.

Smokeless nicotine pouches exist in a gray area for air travel, with TSA allowing them in luggage but airlines having unclear policies about in-flight use, causing passenger confusion.

Scrapping carry-on fees could adversely affect low-cost carriers in the region, which sell unbundled airfares to passengers, charging separately for carry-ons, checked-in luggage, and seat selections.

Spirit Airlines, the Florida-based budget airline, is changing its travel options to emphasize they have premium seating, too. Here's what to know.

Spirit Airlines, the Florida-based budget airline, is changing its travel options to emphasize they have premium seating, too. Here's what to know.