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The Federal Aviation Administration is issuing an order to immediately ground all Boeing 737 Max 8 and 737 Max 9 aircraft in the U.S. The grounding is related to the recent crash of the aircraft in Ethiopia.

Southwest Airlines is the only carrier that operates the 737 Max aircraft at St. Louis Lambert International Airport. In recent weeks, Southwest has operated about five departures and five arrivals on its M-F daily schedule. Destinations and departing cities vary. Southwest operates 118 average daily departures out of STL.

The emergency grounding of the 737 Max aircraft is expected to result in cancellations of some flights this week. The longer impact of flights from or to St. Louis is unknown. Travelers should contact the airline, the airport said.