It's turning into another difficult day for airline travelers in the United States.

Allegiant this week begins nonstop service from Jacksonville International Airport (JAX) to Nashville and the Washington, D.C., area.

Delta Air Lines is reporting profits of $652 million for the second quarter thanks to an increase in leisure travel and $1.5 billion in federal pandemic relief.

Allegiant on Tuesday announced a new nonstop service from Jacksonville International Airport (JAX) to two new destinations: Nashville, Tenn. and Washington, D.C. beginning in November, a release said.

Mario Tama/Getty Images(CNN) - You've probably never given much thought to the quality of the water on an airplane. A recent study ranks the water served on major and regional US airlines. They tied for last among major airlines in the study, which came out at the end of August. Airlines are required to provide safe drinking water for passengers and crew because of the Aircraft Drinking Water Rule, a federal government policy which dates back to 2011. The criteria for the study included fleet size, the number of Aircraft Drinking Water Rule violations, results of water sample reports and how cooperative the airlines were in providing answers to questions about water quality.