Yesterday I received an email from an advertising agency inquiring about the cost to obtain a HR electronic file of one of my pictures here on airliners.net. Their client wants unlimited usage and no photo credit will be given to me. The picture would solely be used for this client and not appear anywhere else. From what I gather the image will be incorporated into a datasheet/brochure for maintenance and refurbishing capabilities distributed to parties owning the aircraft type pictured.
I have yet to sell a picture so I have no idea how much to ask for. Also would anyone here with more experience advise doing this or should I avoid it. I really would appreciate any help and advice that can be offered.