Passengers have been rescued from a plane in the River Mersey as part of a training exercise for staff at Liverpool John Lennon Airport.
The UK's first floating aircraft simulator, which has been specifically built for airport tests, was used in the river earlier.
An RAF search and rescue helicopter, fire crews, coastguard and Merseyside Police were also involved.
Flights were not affected by the special exercise, a spokesman said.
It is a requirement by the Civil Aviation Authority (CAA) for UK airports to hold a full emergency exercise every two years.
This time however, along with Liverpool City Council, Halton Borough Council and the various emergency services in the area, the airport decided to test procedures should an aircraft be forced to make an emergency landing in the nearby river.
Between 30 and 40 volunteers took part in the training.