The University of North Dakota's aerospace school has suspended training flights for one day after a series of landing and take-off mishaps at the Grand Forks airport.

University flight operations director Al Palmer said the latest incident involved a plane that landed Thursday morning without its landing gear down. No one was hurt.

Six other incidents have been reported since July involving student pilots at the airport.

Palmer said training flights are slated to resume Friday afternoon.

Palmer said school officials, instructors and students are reviewing flight and safety procedures with the Federal Aviation Administration.

The aerospace school says it has more than 2,000 students from around the world.