Tsentsan - no problem, in effect the logo on the aircraft is in the public domain. In general there are no restrictions on your photographing anything on public display - even people. However in the case of people, there are restrictions on how that photo may be used depending on circumstances.
The only time an airline may have a case against you is if you took a picture on private property where photographic access has been banned.
LX - yes, it can look a bit petty at times. However
1 - many of us are quite happy to allow free use of a picture in certain situations - we just like to be asked! It is not just about money. There are organisations which I would never want my images to be associated with (eg. Nikon
), and, as the photographer I have the right to control how my image is used.
2 - unfortunately, camera and film companies don't offer discounts to those who do not make a living from photography (perversly, it tends to be the other way round). I, for one, could not afford to continue my current level of photography (in terms of both quantity and quality) without some financial return. While there may be some grey areas, I certainly draw the line at a company profiting from my work at my expense!
3 - being a hobbyist should not mean being unprofessional in terms of quality and handling of your work. I use "professional" in the sense of an attitude to ones own work - this includes having a sense of the value of your work, and treating other photographers (including pros) with respect. It is unprofessional, in my opinion, to devalue your own work - and the work of others - by indiscriminately giving pictures away
Colin K. Work, Pixstel