"An F-7 fighter aircraft of Bangladesh Air Force (BAF) has crashed into the sea after taking off from the BAF Base Zahurul Haque," a defence ministry spokesman told PTI.
The authorities have launched a search operation to trace the missing pilot identified as Flight Lieutenant Tahmid.
A salvage campaign was launched immediately in search of the missing pilot and the plane, the spokesman said.
The navy and the Chittagong port authorities have joined hands with the air force in searching out the missing pilot, said Chittagong Airport Manager Wing Commander Nur E Alam.
"It took off at 11 am (local time) and lost links with the control tower at 11.14am. The aircraft visibly crashed in the sea at around 11.30 am," another official said.