From Travel & Leisure:
After years of development and experimentation with high altitudes and pressure changes, Heineken found a way to have a draft beer — served from a keg rather than a bottle or a can — in the sky.
“Because the air pressure is so much lower in an airplane than at sea level, a traditional beer tap will not work as it will only dispense a huge amount of foam,” Heineken’s Edwin Griffioen said in a statement. “We do have dispensers that work on air pressure, but these were too big to fit in a plane.”
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