Do either of you two understand what perpendicular means? It means the paths WILL MEET at a 90 degree angle. So you are saying that you can jump in a plane, fly it due north at 10,000 feet at the exact same time a 747 heavy is at 10,000 feet flying due east in a perpendicular path and everything is perfectly normal and that it happens all the time.
OMG. Now you telling on yourself. You don't fly.
Flying VFR you would not be at 10,000 feet. It would be 10,500 or 9,500.
Your heading would determine your altitude. Both these planes have different headings.
Stop faking. not looking well for you right now.
and that Boeing would be flying IFR