Why are they spraying the plane?
Spraying the aircraft with very hot, high pressure fluid removes snow, ice, or frost adhering to the wings. Fluids are tinted to make them easier for pilots and ground crews to identify. ... The flight crew can taxi to the runway and safely takeoff. If it's still snowing, there is more to do…
Why do fire trucks shoot water over planes?
The water salute is a touching airport tradition to honor military veterans, foreign dignitaries and new airline service. Salutes typically involve two firefighting rigs spraying arcs of water over an arriving or departing flight. It is a sign of respect, honour and gratitude.