A pilot for AMR’s American Eagle regional unit was arrested Friday at Minneapolis-St. Paul International Airport after failing an alcohol breath test before a flight to New York’s LaGuardia Airport.

Passengers hadn’t yet boarded the plane, and a replacement pilot was brought in to make the trip, said Patrick Hogan, a spokesman for the Metropolitan Airports Commission in Minnesota. Flight 4590 was a regional jet carrying 53 people, AMR said.