When you go airplane spotting is will be important that you will be able to follow them easily. Airplanes move really fast, so having a binoculars with a large field-of-view would be recommended. Further you will need a high magnification in order to see more details.
When you choose to view by hand, the maximal magnification you would be able to use is 10 times. Please note, that the binocular already would be very heavy, so many persons would choose to place such a binocular on a tripod. When you choose to mount the binocular on a tripod, it would be possible to choose one with a magnification of 15, 20 or even 30 times. Below you will some example of binoculars which are suitable for airplane spotting. If you click on the image of the binoculars, you will be taken to the product directly for more information.