This is my first ever animated GIF file. 

It was created using Adobe flash CS6, in the Adobe Master Collection.
I first created a new file in Flash CS6, and selected "Action Script 3.0". I ensured that my stage size was set to the appropriate setting (550 by 400 pixels).

 Then, I located and imported my chosen rocket graphic file into library. I clicked on the "modify" option and selected "convert to symbol", before saving the rocket as a graphic.
I selected the 75th frame and made it into a key frame. I dragged the rocket to the top left corner of the screen, just off the stage. Next, I dragged the rocket in a straight line across the stage from left to right. I then clicked frame one, held down the "shift" key, and clicked on frame 75. This created an arrow between the two frames in the timeline. Finally, I right clicked the rocket and selected "classic tween" before saving as a GIF file.