The US President and his wife Michelle will arrive in the UK on Thursday (April 21) night to visit the Queen on her 90th birthday, just days after a suspected drone hit a British Airways flight landing at Heathrow Airport.
Restrictions are in place for the skies between Windsor and London on Friday (April 22) - when the Obamas will join the Queen for lunch at Windsor Castle the day after her birthday celebrations - and between Stansted airport and London on Thursday night and Sunday morning.
Pilots of other aircraft wanting to fly in the restricted areas must seek permission from the Metropolitan Police.
The regulations prohibit aircraft from flying below 762 metres (2,500 feet) within the specified areas unless they are using Heathrow, Stansted or London City airports, London Heliport, RAF Northolt or are being operated by the emergency services.
Similar rules have been put in place for previous significant events such as high-profile visits and major sporting fixtures.
Helicopters in Hillingdon arouse speculation ahead of the visit
Residents took to Twitter after spotting military flying near RAF Northolt on Tuesday (April 19) and speculated about whether this had anything to do with the presidential visit.
One eyewitness said: “I'm in Hayes End and I saw two war planes flying low, then behind them there were two police helicopter escorting, two other helicopter and then around 15 minutes later there were three war plans flying low and two police helicopter escorting three other helicopter.”
The helicopters spotted included an Osprey US Military helicopter and a police helicopter, which used RAF Northolt's 'heli lines' and were just passing through.
An RAF spokesperson said: “RAF Northolt is providing contingency operational support to United States personnel and equipment during the presidential visit.
“No VVIP delegations are expected at RAF Northolt.”
The ban on drones comes within a week of a pilot on an inbound British Airways (BA) flight into Heathrow Airport from Geneva, reported that an object, believed to have been a drone, had struck the front of the aircraft on Sunday (April 17).
A police Chief Superintendent slammed the 'very real dangers' of 'reckless' drones after the incident are appealing for witnesses.
Seema Malhotra has called for an urgent review over the use of drones , with the Feltham and Heston MP labelling the incident as ‘shocking’ and called for stronger rules and a better education on the remote-controlled flying technology which has seen a rise in the number of near-misses near Heathrow Airport.