Easy airplane program
A short(ish) version: for a tabletop computer or a laptop with Windows, any of the Microsoft Flight Simulator series will be fine. They are easy to use, and as you get better, you can add more and more realism.

If you want good graphics, these kind of games typically require quite a powerful computer, but a basic setup will get you started.

If I recall correctly, from MS FS 2004 onwards, you even get other planes flying around, and there is air traffic control you can communicate with via preset phrases.

MS should release a new version in the coming months, but I would remommend an older version, as one can probably find the a ta fraction of the price of the coming version(Amazon.co.uk less than 10£).

You should make sure the version you are about to buy is compatible with your Windows version. MS FS 2004 for example should run fine with Windows 10. 

There is also X-Plane, I tried one years and years ago, but I recall it being not as easy to use. Flying I guess was pretty much the same: close enough for the real thing.