Virgin Atlantic has called for a review into restrictions on what passengers can take on planes.
The company said it was time to reassess hand luggage regulations.
British Airways (BA) mirrored Virgin's call and said it was "sensible" that the rules governing the restrictions were kept under review.
Rules about what could be taken on to planes were changed in August last year following the arrest of a number of men accused of plotting mass murder on transatlantic aircraft.
Eight men were tried over an alleged plot to blow up planes. None was found guilty of the aircraft plot but three were convicted of conspiracy to murder, following a trial at Woolwich Crown Court, in south east London.
The Government has ruled that restrictions on carrying liquids and gels in hand luggage on flights must continue despite the inconclusive verdicts.
But Virgin Atlantic director of communication Paul Charles said: "Maybe now is the time for a review to be held on whether the restrictions in place on hand luggage and liquids should still take place. Passengers are still confused, there are different rules all over the world.
"There needs to be some consistency worldwide on what you can and what you can't take on board. We have been saying this for six months or so now."
A spokeswoman for BA said: "Our position is that we believe it's sensible for rules to be kept under review."
The restrictions caused chaos at airports when they were brought in last year and resulted in delays as customers were left unsure about what they could take on to flights.
