The Coast Guard said it has suspended its search in the Atlantic Ocean for any survivors aboard a small plane that went missing Monday while carrying a pilot, a woman with connections to Southold and her two young sons.

The Coast Guard said it searched for more than 75 hours over 11,140 square miles — an area larger than the state of Massachusetts — before suspending the operation at 8:45 p.m. Thursday.

“This was a swift and significant loss and its impact has reverberated through everyone that participated in the search,” said Christopher Eddy, search and rescue mission coordinator. “Our hearts and prayers go out to all of the families involved.”

The Coast Guard said the National Transportation Safety Board had assigned an investigator to the case.

Part of a seat, an air intake plug and fuel from the plane were found Wednesday in a debris field in the Bermuda Triangle, the agency said.

Some of the recovered items were determined to be from a Mitsubishi MU-2B turboprop, the same model as the missing aircraft, the Coast Guard said.

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The twin-engine aircraft bound for Florida from Puerto Rico was carrying Manhattan CEO Jennifer Blumin, 40, her sons Phineas, 4, and Theodore, 3, and pilot Nathan Ulrich, 52, of Lee, New Hampshire.

Communications were lost on Monday afternoon while the plane was about 37 miles east of Eleuthera, the U.S. Coast Guard said.

The Coast Guard had hunted for the plane since Miami air traffic control reported it had lost radio and radar contact at 2:10 p.m. Monday.

The plane was traveling about 300 knots and was 24,000 feet above the ground when it lost contact with air traffic control, the Coast Guard said. The trip began in Borinquen, Puerto Rico, about 11 a.m., the Coast Guard said, and the travelers were headed for Titusville, on the Atlantic coast of Florida.

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Blumin is the founder and chief executive of Skylight Group, a Manhattan firm that finds venues for top fashion shows.

The 10-seat plane is registered to Ithaca Consulting, which is listed as having the same Southold address where records show Blumin owns a home.

Ulrich owns Xootr LLC, which makes scooters, and he is also the technical director of Radon Sport LLC, which works on race cars, according to his LinkedIn page.