Industry trade group Airlines for America estimates U.S. airlines will carry 234.1 million passengers this summer, a 4 percent increase over 2016 and a new record for global air travel on U.S. carriers.

The report showed these airlines are adding 123,000 seats to accommodate the additional 100,000 people expected to be flying daily June 1–Aug. 31.

“Rising US Gross Domestic Product, a steadily improving economy, an all-time high household net worth and historically low airfares are proving to be the perfect combination for the expected growth in summer air travel,” said John Heimlich, vice president and chief economist, A4A. “We continue to see consumers value experiences and travel, and airlines are responding accordingly by increasing staffing and boosting the availability of seats in the marketplace, as well as further investing in new aircraft and customer-facing technology.”

A4A also reported domestic seat supply rose 3.8 percent in 2017, reaching the highest level in a decade. International seat supply went up 6.1 percent, also hitting an all-time high.

The increase in passenger counts mean higher revenues for airlines, the report noted, but not more profits. In the first quarter of 2017, air passenger traffic increased 1.6 percent while airline revenues rose 1.5 percent, to $37 billion. But airline earnings dropped $2.4 billion, down from $4.8 billion in 2016, as fuel and labor costs remained high.