Contact has been lost with a light aircraft off the coast of Blackpool, police said.
Lancashire Police, along with other agencies, are responding to the reports and a search is under way.
Emergency services were contacted shortly after 9am.
The aircraft was travelling from the Isle of Man to Blackpool Airport with one person on board.
Contact was lost with the pilot some three miles out at sea.
A spokesperson for Lancashire Fire and Rescue Service confirmed that crews from Lytham St Annes and Bispham were at the scene providing assistance.
A spokesperson for Lancashire Fire and Rescue Service said: "We got a call at 9:17am from police, the information given was that (there was) a light aircraft on route from the Isle of Man to Blackpool Airport with one person on board, obviously the pilot. The communications were lost with the air traffic control some three miles out at sea."
A multi-agency search operation is now under way.