The U.S. Department of Transportation on Friday announced a $2 million fine against JetBlue for “operating multiple chronically delayed flights,” marking the first such penalty by the federal agency.

Airlines are prohibited from offering unrealistic schedules that don’t reflect actual flight departure and arrival times, yet an investigation by the DOT found that JetBlue operated four chronically delayed flights at least 145 times between June 2022 through November 2023, according to the DOT.

Each flight was chronically delayed for five consecutive months or more. Despite DOT warning JetBlue about inaccurate flight departure and arrival times on its flight between John F. Kennedy International Airport and Raleigh-Durham, North Carolina, the airline continued to operate three more repeatedly delayed flights between Fort Lauderdale and Orlando, Florida and JFK; and between Fort Lauderdale and Windsor Locks, Connecticut, the agency said.