Air travel is bouncing back ... sort of

Washington(CNN Business) Air travel is nowhere near pre-pandemic levels. But it began bouncing back in May.

The number of people passing through airport security checkpoints nearly doubled over the course of the month. The Transportation Security Administration says it screened nearly 949,000 passengers over the past weekend. It scanned 476,000 people over the first weekend in May.

American Airlines (AAL) said more people traveled this past weekend than over Memorial Day, the start of the summer travel season.

Although the increases are significant, the pandemic has dealt an unprecedented blow to the industry. During the busiest day in May, only 14% of travelers flew compared to the equivalent day in 2019.

That's why several major airlines are talking about the need to cut their employee count in October, when federal money for airline payroll costs expires. Some airlines are offering buyouts to avoid layoffs.

More passengers are also filing onto each flight. Domestic flights carried an average of 47 passengers each this weekend, up from an average of only 17 passengers at the beginning of May, according to Airlines for America.

Those loads are unprofitable, so more passengers on flights means airlines will burn less cash with each takeoff and landing.

Southwest Airlines CEO Gary Kelly said Friday his company is anticipating "a brutal low-fare environment as there are far more airline seats right now — and there will be for some time — than there are customers."

But increasingly full flights also present challenges for travelers to socially distance in small aircraft cabins. Photos of aircraft cabins without an empty seat next to each passenger have drawn attention when posted to social media.

Frontier Airlines is preparing for an increasing number of passengers on its flights by screening temperatures at the departure gate and denying boarding to anyone who is feverish. Airlines for America is urging the Transportation Security Administration to handle temperature screenings.

Airlines are also adding to their schedules and flying more planes. Industry-wide, about 200 fewer aircraft are sitting idle than in mid-May, when the airlines parked more than 3,200 planes. The tracking service FlightAware says it saw a nearly 7% increase in US flights since early May.

Southwest is bullish enough that it is adding nearly a dozen new routes to its schedule this winter.