Airports and dates are the only things that matter for being "too much" right now.
Your first is 4 * 3 * 2, which is 24, which is well over the 6-7 limit I mentioned
Your last is 2 * 2 * 1, which is 4, which should work. It did work for me.
Also, I just deployed a broken form, so uh, don't use the form yet
Edit: Fixed the form