The Duke of Cambridge is expected to take to the air in an historic aircraft when he visits an RAF base that his home to the Battle of Britain memorial flight.
William is patron of the body that is responsible for keeping aircraft like the Spitfire and Hurricane in the air from its home at RAF Coningsby in Lincolnshire.
Commemorations to mark the 75th anniversary of the Battle of Britain have been staged in the last few weeks and weather and aircraft permitting the Duke will join the crew of a Dakota for a flight.
During the visit William will meet pilots, ground crew and their families from 29 (Reserve) Squadron which not only trains Typhoon jet pilots but is one of a number of squadrons that helps defend the skies above the UK.
Typhoons have been scrambled from Coningsby a number of times this year after Russian aircraft were identified flying in international airspace close to UK airspace.
The Duke is Honorary Air Commandant of the RAF base, and during the visit he will observe the 100th anniversary parade of 29 (Reserve) Squadron.