For a simple demo it best to stick to the Flight app. Demonstrate recording a flight booking, add a checkpoint and replay showing results. Next show how you can parameterize the test script to run 2-3 iterations and run. If you can prepare a short test against an Oracle form then load it and run to show the potential and speed of execution.
If you had to identify, in one word, the reason
why the human race has not achieved, and never
will achieve, its full potential that word would be "meetings".