Airport bosses have issued warnings and advice to passengers about potential disruption ahead of the Queen's funeral.
On Monday the country will be largely shut down as millions of people mourn the death of Queen Elizabeth II.
London is expected to be hugely busy, with National Rail putting on extra services to ensure those who want to offer their respects in the Capital are able to do so.
Many people are flying into the country from overseas to say their final farewells, including Julia McCarthy-Fox who has travelled in from New Zealand.
How to deal with the huge demand for flights into the country from members of the public and world leaders, while giving airport staff the chance to grieve, may prove difficult for those running travel hubs.
Heathrow has announced that it will be disrupting some services this afternoon to ensure that planes do not fly over the route of the Queen's coffin as it is taken from Buckingham Palace to Westminster Abbey this afternoon.
Live departure boards show that the 1.55pm flight to Warsaw has been cancelled, as has the 2.30pm to Stockholm and 2.35pm to Amsterdam.
The 3.10pm to Dusseldorf, 3.30pms to Basel and Faro, 3.35pm to Hamburg, 3.40pm to Rome, 5pm to Hong Kong and 5.15pm to Los Angeles are also off.
In terms of arrivals, the 5.10pm and 5.55pm from Amsterdam to Heathrow, 6.45pm from Dusseldorf, 7.40pm from Basel, 7.45pm from Hamburg and 7.50pm from Split are cancelled today.
It is not clear whether all of these are because of the Queen's procession, or for other reasons such as the Heathrow passenger cap.
A statement posted on the airport's official social media platforms read: "Out of respect for the period of mourning following the passing of Her Majesty The Queen, some flights between 13:50–15:40 on Wed 14 Sept will be disrupted to ensure silence during the ceremonial procession.
“Airlines will notify passengers directly of any flight changes."
Heathrow said it anticipates "further changes" to scheduling on Monday, when the Queen's funeral will take place from 11am.
“We will communicate more details over the coming days," the statement continues.
"We apologise for the disruption caused, as we work to limit the impact on the upcoming events."
On the day of the funeral Heathrow will not be taking private jets, meaning heads of state will either have to fly on commercial planes or make for another airport.
Stansted Airport told The Mirror that it will be accommodating the chartered planes of dignitaries and processing them in private terminals.
"The airport will be operating as normal but we ask all passengers due to travel over the period to follow all the usual advice as the airport is still very busy, including preparing correctly for security before they leave home, arrive at the terminal at the correct time stated by your airline (not too early or late), check for any possible road or rail disruption they may affect their journey to and from the airport, and if in any doubt, check with their airline for the latest flight information," a spokesperson for Stansted said.
Gatwick, Liverpool and Manchester airports have all said they are not expecting any disruption to their schedules on Monday.
"Across the transport industry, services are expected to be much busier than usual throughout the period of mourning," Manchester Airport guidance reads.
"Plan ahead, check before you travel and allow more time for your journey."
A spokesperson for Birmingham Airport said: “Birmingham, like most regional airports, will remain open to meet the requirements of airlines on Monday.
"Staff and customers will observe the national silence in and around the airport. We intend to pause take-offs and arrivals for the period of the national silence.”
Due to the sheer number of people wanting to pay their respects to the Queen, the government has urged political leaders not to arrive in UK in helicopters.
Guidance sent out to potential visitors urges them to keep their parties as small as possible.
"The royal funeral unit would therefore be grateful if accompanying delegations can be kept as small as possible. This will also reduce disruption and transit time at airports," the guidance reads, Politico reports.
"Where possible, overseas representatives should plan to arrive in the UK at least one day before the state funeral or the first event, which they are attending.”
Ahead of the funeral on Monday, a ban on planes, kites and small balloons flying below 2,500 feet above certain parts of London has been enforced by the Civil Aviation Authority.
On the day of the funeral, air traffic restrictions may be in place at Heathrow, as normally flights arrive over central London and take off over Windsor, where the Queen will be interred.
Luton and Leeds-Braford airports have been contacted for comment.
