For Heineken, it was something of a technical challenge.
Edwin Griffioen, who designed the new installation, said: "Because the air pressure is so much lower in an aeroplane than at sea level, a traditional beer tap will not work as it will only dispense a huge amount of foam.
"We do have dispensers that work on air pressure, but these were too big to fit in a plane.
'It was one big jigsaw puzzle, as the keg of beer, the cooling system and the air pressure compressor all had to fit in an airline catering trolley.
"In the end we had to leave out one of those pieces to make it all fit, so with pain in our hearts we had to leave the cooling behind."
The kegs of beer - four per flight - are now being delivered to Amsterdam Airport already cooled.
Griffioen said: "We redesigned the trolley to resemble a giant thermos flask. The beer has to remain under five degrees Celsius.
"In our latest test, we easily managed a temperature of 3.5C after seven hours.
"We managed to set the diameter of the tap and the air pressure to exactly the right combination, which delivers at 36,000 feet exactly the same beer as you would get on the ground."
Unfortunately for Griffioen, he might have to wait to see his invention on board KLM planes.
KLM was set to introduce draught beers on a flight to Curacao on July 2, but had to postpone it as it is still waiting for the right safety certificates from civil aviation authorities.
They expect to be able to use the new device on some select flights from August onwards.
