Traveling by plane involves small routines that many passengers already know well, from boarding to the moment the crew starts serving drinks. But there are details of the onboard service that go unnoticed and that, under certain conditions, can transform a simple drink into an order that takes longer than it seems.
The drink in question is Diet Coke, a sugar-free cola very popular in the United States and close to the light or zero versions that many passengers know in Portugal. At first glance, it seems like a banal request, but some cabin crew, such as a flight attendant in Canada identified as Jet, cited by the blog, point out it as one of the most difficult drinks to serve during the flight.
Why does this soda require more work?
The problem is not the flavor or the brand, but the foam. When a can of soda is opened and served on a plane, cabin pressure causes the carbonated drink to release more bubbles than it would on the ground. In the case of Diet Coke, this effect tends to be more evident and forces the crew to pour the drink little by little.
On a commercial plane, the cabin is not pressurized as if it were at sea level. On many flights, the pressure equates to an approximate altitude of 7,000 to 8,000 feet, which helps explain why carbonated drinks may foam more on board. The most common technical reference indicates that pressurized cabins are maintained, as a general rule, up to about 8,000 feet equivalent altitude.
According to the explanation published on the same blog, the crew may have to wait for the foam to subside before being able to finish filling the glass. On full flights or shorter routes, these extra seconds end up delaying the normal pace of service.
There is also a scientific explanation
Diet Coke and other diet drinks may form a more persistent foam due to their composition. The explains that Diet Coke has a slightly higher viscosity than sugary sodas, which can make the bubbles more stable and make the foam last longer.
This does not mean that passengers are prohibited from ordering this drink, nor that the crew refuses to serve it. It just means that, behind the scenes of in-flight service, some drinks require more patience and attention than others.
A detail that passengers almost never notice
For those sitting, the difference may seem minimal. For the crew, however, serving drinks to dozens or hundreds of passengers on the plane requires speed, organization and time management. When several passengers order the same carbonated drink, the accumulated foam may force them to interrupt the process and return to the glass later.
The cabin environment also affects other sensations during the flight, according to These Gold Wings. Lower pressure, lack of humidity and background noise can alter the perception of the taste and smell of food, which is why some meals seem less intense when they are served on board.
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