Government plans to introduce "enhanced screening" for Ebola at major airports and Eurostar terminals have been questioned after Gatwick said it knew nothing about the measures.
Checks will take place at Heathrow, Gatwick and Eurostar terminals following advice from chief medical officer Professor Dame Sally Davies.
However, a spokesman for Gatwick said they had not been given any instructions on how the screening should be carried out.
World Health Organisation (WHO) director of strategy Dr Chris Dye said the screenings would "hugely increase awareness" but added that it was unlikely to detect anyone with Ebola coming into the UK.
The Civil Aviation Authority said it expected Gatwick bosses to examine exactly what caused Christmas chaos at the airport before deciding what further action to take.
Asked about a possible investigation, the spokesman said:
Gatwick Airport chiefs face a possible investigation over problems faced during the Christmas period amid criticism from travellers.
The airport saw some of the worst chaos on Christmas Eve after a power outage at its North Terminal led to "significant power outages and delays".
Passengers complained of a lack of information and spoke of four-hour delays as more than 35 flights were cancelled.
The airport's official Twitter account said:
There will be no Heathrow Express trains today or on Boxing Day, the account for the train service said.
Airline easyJet said it would be operating a limited number of flights from Gatwick Airport today to replace ones that should have operated yesterday.
These include flights to Faro, Basle, Malaga, Alicante and Amman, while passengers from a cancelled flight from Gibraltar to Gatwick will be travelling on one from Malaga today.
EasyJet said it would be unable to schedule any further flights today because of limited capacity at airports and crew availability.
A spokesman said:
A passenger at Gatwick Airport has told ITV News there is "total mess" after flight cancellations and delays after a power failure in the north terminal led to a backlog of luggage.
Lilly Evans said: "bags are mixed, those that were destined to go on cancelled flights to different destinations and those who landed in UK".
The airport has said that "a full service" will be in operation today but advises passengers to check with airlines for the status of their flights as most will now be running from its south terminal.
Hundreds of passengers at Gatwick Airport have been left without their luggage after delays and cancellations after a power outage in its north terminal.
One passenger waiting to get his bags back after an earlier flight cancellation tweeted this picture.
Some frustrated passengers affected by travel disruption at Gatwick Airport after a partial power failure in its north terminal have taken to Twitter to express their anger.
A passenger whose flight has been cancelled after disruption at Gatwick airport has tweeted this picture of fellow travellers gathered in the terminal.