The Queen's planes are set to be sold off next year as part of defence cuts, according to reports.
The move may force her, and other members of the Royal Family, to use Boris Johnson's jet instead – which has a huge Union Flag design on the aircraft.
Airliners used by the royals since the 1980s are set to be withdrawn from service to save money, and there won't be a dedicated aircraft for the first time in the Queen's reign.
Reports state there are currently no plans for a replacement for the four BAE-146 passenger jets.
The Queen, Prince Charles and the Duke and Duchess of Cambridge will have to share the Prime Minister's RAF Voyager plane, which underwent a controversial £900,000 makeover in 2020.
The decision is part of the Ministry of Defence's Integrated Review, which also plans to reduce the Army by 10,000 soldiers.
Important ships and frontline aircraft are also set to be withdrawn from service as part of the controversial plans.
The results of the review are due to be formally revealed in two stages later this month.
The four BAE-146 regional planes are part of the RAF's historic 32 (Royal) Squadron, known as The Queen's Flight.
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It means the squadron, based at RAF Northolt non the outskirts of London, will only have an AQ-109 helicopter, which can only carry out short flights in Britain.
In 1994, Prime Minister John Major decided the costs of refitting her yacht, HMS Brittania were too much and decommissioned her. The Queen shed a tear when the yacht was taken out of service in 1997, reports the MailOnline.
Tobias Ellwood, chairman of the Commons defence committee, said: "The selling off of the BAE-146s will leave a gaping void in the RAF’s ability to meet military and civil taskings.
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"The BAE-146 is a highly valued versatile aircraft that has served senior members of the Royal Family, military commanders and prime ministers with distinction for decades."
Labour MP Gareth Thomas, whose Harrow West constituency is close to RAF Northolt, said: "Ministers need to explain as a matter of urgency how the Queen and Royal Family will be transported to fill crucial royal and Commonwealth responsibilities. They continue to deserve proper support not least as they are one of Britain’s most popular and visible international assets."
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