Virgin Atlantic has confirmed it has been forced to operate some near-empty flights after bookings were dented by the coronavirus outbreak.
It is operating the flights to try to retain take-off and landing slots at major airports such as Heathrow.
Under European law, if flights are not operated, slots have to be forfeited.
UK Transport Secretary Grant Shapps has written to the European Commission, asking for rules on slot allocation to be relaxed during the outbreak.
Other carriers are thought to be taking similar steps - even reportedly flying so-called "ghost planes" with no passengers on board at all in order to safeguard their presence at major hubs.
'Use it or lose it'
Airline passenger numbers have fallen dramatically in recent weeks due to the coronavirus outbreak. On some routes they have halved and carriers have been cancelling services.
However, this could cause them a serious problem, particularly if they fly out of large or heavily congested airports. Under international guidelines, which are enshrined in European law, take-off and landing slots at these airports are limited.
In the UK, the rules apply to Heathrow, Gatwick, Stansted, Manchester, London Luton and London City.
Slots are granted according to historical rights at these airports. If, for example, a carrier operated a particular schedule through the summer season last year, it retains the right to those same slots this summer.
'Wasting money and fuel'
Airlines are now lobbying hard for the rules to be relaxed.
Tim Alderslade, chief executive of the industry body Airlines UK, said: "It makes no sense whatsoever under these unique and challenging circumstances to force airlines to fly empty aircraft, wasting money and fuel and creating carbon emissions".
He added: "We urgently need a temporary suspension of the rule - as happened during the financial crisis - to allow airlines to respond to demand and use their aircraft efficiently."
However, if the rules are to be relaxed, the decision will have to come from Brussels. Although the UK has officially withdrawn from the European Union (EU), an EU regulation on slot allocation still applies.
On Monday the Transport Secretary Grant Shapps wrote to the European Commission. He asked it to introduce "practical and proportionate measures" to address the situation, possibly including "flexibility with the 80% threshold, implemented on a market-by-market basis or more broadly".
The body directly responsible for slot allocation in the UK, Airport Coordination Limited, has joined other organisations from across Europe in calling for the "use it or lose it" measure to be suspended from mid-February until the end of June.
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