Video above: Who is and who is not attending the Queen’s funeral

Flights to and from London's Heathrow Airport on the day of the Queen's funeral are being canceled or re-timed "as a mark of respect" to the late monarch.

In a statement issued on Thursday, the U.K.'s busiest airport confirmed that it would be making "appropriate changes" to operations "in order to avoid noise disruption" during Queen Elizabeth II's state funeral at Westminster Abbey and the Committal Service at Windsor Castle on Monday.

U.K.'s national carrier British Airways has already canceled 50 flights short-haul on Monday, while Virgin Atlantic has canceled four U.S. flights to and from Heathrow Airport.

The operational changes, likely to impact thousands of passengers, have been put in place to ensure "quiet skies" during specific times during the day, and will affect about 15% of Heathrow's schedule.

There will be no aircraft movement at the airport for 30 minutes from 11:40 a.m. and 12:10 p.m (GMT) to ensure that there is no disruption during a two-minute silence at the end of the funeral is not disrupted.

'Quiet skies'

Arrivals to Heathrow will also be halted from 1:45 p.m. and 2:20 p.m. "to ensure silence during the ceremonial procession" (GMT,) and there are to be no departures for one hour and 40 minutes from 3:05 p.m. (GMT) as the ceremonial procession approaches Windsor Castle for the interment.

Meanwhile, departures are to be "reduced" from 4:45 p.m. to 9 p.m. during the committal service at St George's Chapel.

"In order to observe these moments on Monday, airlines will need to adjust their schedules accordingly, which will mean some changes to flights," reads a statement from Heathrow.

Video below: Mourners pay respects as queen lies in state

"Passengers affected by these changes will be contacted directly by their airlines about their travel plans and the options available to them."

Flights will also be diverted around Windsor Castle, located around 12 miles from Heathrow, on the day "to minimize noise during the private family service and interment."

Meanwhile, Virgin Atlantic has stressed that while "the vast majority" of flights are scheduled to operate as normal, there will be some adjustments to "accommodate restrictions" during the state funeral and committal ceremony.

A number of shops at Heathrow Airport will also be shutting their doors on Monday, which has been declared a public holiday in the U.K.

"As a mark of respect for Her Majesty Queen Elizabeth II on the day of her State Funeral, we have reduced our schedule and re-timed some flights at Heathrow to ensure the skies are quiet at certain moments on Monday September 19th," reads a statement from British Airways.

Video below: Royals walk behind Queen's coffin in Edinburgh

"Our thoughts remain with the Royal Family and the nation."

CNN has contacted Heathrow Airport for further comment.

Wednesday marked another rough day in travel in the U.S. as hundreds of flights were again canceled across the country.

According to FlightAware, U.S. airlines had canceled more than 800 flights by 12:30 p.m. ET on Wednesday afternoon. That comes a day after nearly 1,300 flights were canceled across the country on Tuesday.

United alone canceled 158 fights Wednesday, representing about 7% of the day's air traffic. Delta also canceled 103 flights.

The travel woes continue a trend that started last week following the Christmas holiday. Several airlines have confirmed that staffing shortages caused by COVID-19 infections have led to flights being canceled in the past week.

CNN obtained an internal memo from United last Thursday that noted that the rise of the more contagious omicron variant had a "direct impact on our flight crews and the people who run our operation."

In a statement earlier this week, Delta Airlines told NPR that omicron staffing shortages also factored into its decision to cancel 344 flights on Christmas Day. NBC News reports that JetBlue and Alaska Airlines have also cited staffing shortages and COVID-19 outbreaks as reasons for canceling flights.

The flight cancelations will likely continue later on in the week. FlightAware says about 400 domestic flights scheduled for Thursday have already been canceled, in addition to 67 flights already canceled for Friday.