The odds are about 1 in 500,000. While these accidents are rare, they do happen. The most probable place is on final approach to landing.
The colliding air masses in Tornado Alley are warm, moist air from the Gulf of Mexico, cool air from Canada, and dry air from the Rockies. This collision is just part of the recipe for tornadoes.
a cold air mass colliding with a hot air mass
Sound Waves
Air masses or weather front is when two regions of air are colliding and they have different temperatures and pressures are similar.
So slim that it is nearly impossible, considering two balls should never be in the air at the same time on one hole. From holes going in different directions, it is slightly more likely, but still nearly impossible. The greatest chance would be if you tried to do it, but you could be there for some time.
Probably the internet somewhere.
Sound Waves
when a cold air front meets a warm air front
If you mean, "What is the Vne (Never Exceed Speed) of a Cessna 172?" the answer is 163 KIAS. KIAS means Knots Indicated Air Speed.
In the air there is not anything that they need to see since air traffic control keeps them from colliding with other planes. When landing the have lights on the runway and on the plane. they also have radar to keep them from colliding with other planes.From the lighter side: Airplanes can't see!
Air has pressure because air has mass and weight.
The training that is required to fly a Cessna 172 Skyhawk is to be a Certified Flight Instructor, Air Transport Pilot, and to be experienced in Complex Aircraft Endorsement.