WASHINGTON — The U.S. National Transportation Safety Board said on Sunday it is sending a team to investigate a Wednesday close call between a Southwest Airlines jet and a medical helicopter near Cleveland International Airport in Ohio.

The NTSB said the two aircraft experienced a loss of separation — meaning they came closer to each other than the required minimum safe distance — when Southwest Flight 1333 was making its final approach on a flight from Baltimore-Washington International Thurgood Marshall Airport (BWI).

This prompted the Southwest pilot to abort the landing. Southwest said the Boeing 737 landed safely a short time later.

The NTSB and Southwest did not disclose the number of passengers and crew aboard the airliner. The helicopter appears to have been transporting a patie

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