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Well technically you can make a ducted fan plane but it is highly inefficient as battery technology is still in its infant stages as well as batteries are still very heavy. Secondly Jet engines are basically high bypass turbines.. They can technically run on many different fuels such as diesel, kerosene, and propane.
Usually, once you have a private pilot certificate you would go for an instructor rating and work as a flight instructor to build flight time (while making money). Along the way you could also be working on your commercial, multi engine, and air transport pilot ratings and certificates. It takes time to get into the airlines, mostly because you need to build flight time and experience. Even when you first break into the airlines the pay is kind of pathetic, but it builds quickly over time.
Your question is a good one - but the answer is much more complicated that you would expect. Think about driving your car from point A to point B across a city. Lots of paths - some shorter than others, but the shortest path may not be the quickest. Or the quickest may involve a toll road - and you may or may not be in a hurry.
The usual most important factor (for commercial operations, at least) is to save money, while still arriving on time. Airplanes in the air are subject to the winds aloft, which will generally be at different strengths AND DIRECTIONS at different altitudes. Most airplanes operate more efficiently at higher altitudes (up to limits), but at those higher altitudes the plane may face stiffer headwind. Further, it costs time and fuel to climb to those altitudes, and you will not regain coming down as much as it took going up. [Think of a bicycle on hilly terrain vs. level ground.]
So what's the answer? Well, for most trips the pilot will consider all these factors. They are taught during training how to plan the flight in terms of time and fuel required, and to include in that especially the winds at different altitudes. Then they will pick the altitude, whatever that is, that maximizes the results that they consider most important.
Aircraft too heavy. Weight is extremely valuable/expensive and the weight of a parachute system would be too heavy and costly, sacrificing room for paying passengers.
Students and certificated pilots both are required to remain current and to have a check ride (flight review with an instructor) every 24 calendar months. The ones you're seeing are probably going out to the practice area to practice their flight maneuvers. If a pilot doesn't practice regularly his or her skills can deteriorate rapidly.
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