3 ms·Airplanes are not pressurized to sea level though, water boils at lower temperatures at altitude.by rjsw 9y agoAirplanes are not pressurized to sea level though, water boils at lower temperatures at altitude.spiznnx 9y agoOn airplanes, pressure is equivalent to about 2000m ASL, at which water boils at 93.4 °Crjsw 9y agoThere are several ski resorts at 2000m, you notice the difference in coffee temperature from sea level.