Higher costs and low base fares send Delta's profit down 29%. The airline still earned $1.31 billion

The Delta logo at the Atlanta airport.

A man waits for a Delta Air Lines flight at Hartsfield-Jackson International Airport in Atlanta, Jan. 7, 2022. (AP Photo/Charlie Riedel, File)

Americans are traveling in record numbers this summer, but Delta Air Lines said Thursday that it saw second-quarter profit drop 29% due to higher costs and discounting of base-level fares across the industry.

The airline is also predicting a lower profit than Wall Street expects for the third quarter.

On a call with analysts and reporters, Delta CEO Ed Bastian sent a clear message to low-cost carriers: Slow your growth to end the oversupply of seats on domestic routes.