Three people ride on twin-engine Boeing 767 operated by Atlas Air Inc. when it drops before 12:45 p.m. CT, said by FAA's Lynn Lunsford.
T the flight number is 3591, according to FAA.
The plane is located at Jack's Pocket at the northern tip of Trinity Bay, Chambers County Sheriff's Office said on Facebook.
The National Transportation Safety Board has been notified and leads the investigation, Lunsford said.
Boeing said that it was near the situation.