I’ve created a simple demo of the kind of thing I expect for assignment 1. You can play it online here.

You can control the plane with the arrow keys. Notice the “physics” are very simple. You don’t need to try to simulate realistic flight.

For the two other moving things requirement, I added a blimp which circles the centre building and a collection of cars which flee from the plane if it comes too close. Of course, you don’t have to follow my example here. You can add any other objects you want, as long as you have two distinct movements.