Eli5: How can something as heavy as a aeroplane can lift and even more interesting how can it maintain a certain height for very long time above the air?

Question

Also if someone says increase engine power doesn’t that increase planes weight which means you need more engine power and it goes into a infinite loop

In: 0

Answer 1

Engines push(or sometimes pull) the plane forward through the air.

As such, the air moves over the wings.
[The shape of the wings provides lift if air is moving over the wings.
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Engine power can be surprisingly low. A small single engine aircraft that can fit 4 people(under certain conditions) very well may have less than 200hp.

Maintaining altitudes is relatively straight forward, engine keeps providing forward movement, air keeps moving over wings.