I would assume that the first aircraft actually in use by the military were the dirigibles known as "airships." That and the branch that was most interested in airships were the naval powers more then ground forces. The Navies of the world were very interested in balloons and dirigibles (blimps, rigid and non-rigid) for observation purposes. It being a ship of the air combined being used heavily by naval groups contributed to the same nomenclature as sea going vessels.
That and aircraft operate in a 3 dimensional space, being able to point in any direction with only one consistency, up and down. So left and right can be in any direction, and since an airplane can be in any position in the air, how does one decide what is left and right when an aircraft is upside down?
Update from a 747 pilot: The left and right side of aircraft are indeed referred to as port and starboard. Have you ever noticed the lights on the wingtips of an aircraft? The left side has a red light and the right side has a green light. Go look at a boat sometime... you'll notice they have the same lighting pattern. There are many other similarities between airliners and sailing ships (i.e. the aircraft commander is referred to as a "Captain" and the pilots wear naval style uniforms). As to why aircraft are referred to as sailing vessels is a completely different question to be answered elsewhere.
One line abreast of airplanes (left to right/right to left) is the first wave; follow on waves of airplanes will directly follow behind them.
its on the bottom
writing
Picture the board in front of you. On the extreme left in the corner closest to you is the square A1. Move one square to the right and up to the third square from there you will find B3. The lines of squares going up and down are called files and are designated A to H beginning on the left and moving to the right. The lines of squares going horizontally are numbered 1 to 8 again moving from left to right. Thus, the square directly diagonally across the board from A1 up to the square on the extreme right and all the way up to the opponent's side is called H8.
Khabba And right (side) is called sajja
cuppid shuffle i think
In very old sailing vessels, the ship didn't have a rudder built into the ship; instead, a long oar-shaped "Steering board" was mounted near the stern of the ship, and generally on the right side. This steering board could be damaged if it banged into the dock, and so generally the ship came to the pier with the left side of the ship. We now call the left side the "port" side of the ship, and the right side is the "steering board" or "starboard" side.
Depends on what side, the left side is called the left side and the right side is called the right side
the right side. the left is port side
ambidextrous
In the background sky, the plane flies from right to left. You have to destroy it when its there, because it wont die after it comes from left to right. I think it takes 1 shot from the machine gun to destroy.
it moves from left to right