Kites, drones, and balloons have been banned from flying low over London, and the UK's busiest airport is adjusting its schedule ahead of the Queen's funeral

Kites, drones, and small balloons are not allowed to fly over central London while the country mourns the death of Queen Elizabeth II.

In a press release Tuesday, the UK's flight safety regulator pointed to a Friday announcement that no aircraft is to fly below 2,500 feet.

The Civil Aviation Authority said that the ban is part of the overall security plan.

Millions of people are expected to flock to the capital to see the Queen lie in state before her funeral on September 19.

Rail operators are laying on extra trains or extending services to and from the capital due to the cancellation of long-planned strikes by transport workers.

London's Heathrow Airport warned passengers that flights could be disrupted on Wednesday afternoon in order to ensure silence over central London.

The Civil Aviation Authority said in a Friday release that the term "aircraft" includes any small balloon, kite, or aircraft.

The ban doesn't apply to planes that make an approach to or departure from London City airport. There will be additional restrictions issued in the future.

The body did not reply immediately.

The airspace was temporarily closed to allow the flight carrying the Queen's coffin to leave safely.

The journey to London was tracked by almost five million people.