Airlines Altimeter Pitot Tube 
AeroSavvy
OCTOBER 26, 2020
Airlines are upgrading older cockpits with newer displays, so this old indicator will soon become a relic. Ram air from a pitot tube and static (undisturbed) outside air from a static port, usually a hole on the side of the fuselage. Procedures may differ on other aircraft and at other airlines.
Air Facts
MAY 5, 2025
A few minutes later, we heard the center controller clear a Trans Missouri Airlines commuter plane for the VOR Runway 30 approach to Jefferson City. Passing through 2,800, the altimeter almost stopped, but finally, at 2,900 we punched through the inversion layer! How can this be? Up we went, trading airspeed for altitude.
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