This is from my father-in-law who was in the AF back in the day of the Army Air Corps:
You had a seat, plastic bags, or a can... oh this modern AF. Now in the old Corps all we had was a small sliding door about 9"x"9 in the floor. When you needed to go you went back there, slid open the door, took aim, and let the suction do the rest. When jets came into use it became a little trickier when doing #2. You had to hold onto something because if you slipped, your ass got suctioned to the trap door and chilled pretty damn quickly. Which is why there was always a small wooden club nearby. In case you got stuck, you could use the club to beat on the floor with in hopes someone would hear you and come back and pull you off the door.
You had a seat, plastic bags, or a can... oh this modern AF. Now in the old Corps all we had was a small sliding door about 9"x"9 in the floor. When you needed to go you went back there, slid open the door, took aim, and let the suction do the rest. When jets came into use it became a little trickier when doing #2. You had to hold onto something because if you slipped, your ass got suctioned to the trap door and chilled pretty damn quickly. Which is why there was always a small wooden club nearby. In case you got stuck, you could use the club to beat on the floor with in hopes someone would hear you and come back and pull you off the door.