About 21% oxygen

Nitrogyn 78%,oxygen 21%,other gases 1%

Victor Juliet Romeo

The lower aeroplane (light aircraft)

121.5 MHz

6 5000 ft

A test made on the radio apparatus to a certain its serviceability when the aircraft is about to depart

To transport oxygen around the body

Inner layer of the atmoshere

Wilco

Cessna 172