By David Shepardson

WASHINGTON (Reuters) -The U.S. National Transportation Safety Board said on Sunday it is sending a team to investigate an October 29 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 t

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