Okay, but not enough interaction
5/10 might be a bit harsh, but that is mostly because I feel you could have done much more with this concept.
Right now you are basically just guessing. There is no real way to check if you can take some extra cargo/passengers, but if there was it wouldnt even be a game.
I suggest remaking this but adding features:
make the user control the plane, have the user control motor speed (left right arrow keys) and climb angle (up down arrow keys). Then, if the user takes extra cargo, he should still be able to make it, but he would have to fly very well. whereas with no cargo, itd be an easy flight.
Add some wind currents, and your all set.