Just to be clear, all the images are taken by me so I don’t think there’s any issue with intellectual property?

So, it appears my approach should be as follows:

1) Contact Airshow organisers to ask for their permission to use photos taken whilst at their display.

2) Contact owners of privately owned display aircraft to seek permission to use a photo of their aircraft taken at an airshow/event.

or

3) Give the calendar away for free….but what if it is being used for advertising purposes? I.e. has a company logo/website address/contact details on it?

Thanks for all your replies, although I wish things were a lot simpler!!

Bob