www.netairspace.net I thought I might as well mention this here, there's a new aviation photography website that only started up 6 months a go or so. It's not as large as jetphotos.net, airliners.net or airplane-pictures.net however it is growing steadily.
What seperates this from other websites? They accept ANY pictures of aircraft, and if these photographs meet certain standards (like the above 3 mentioned sites), then they are marked with a quality tag which then promotes the image more predominantly via the search function, and on the front page, etc. Even none quality tagged images reach the front page from time to time.
I know the folks behind this website and have watched the website grow since launch and have been throughly impressed at how it's grown.
So if you'd like to upload any aviation images, and not have to worry about them being rejected then nip on over to netAirspace and join. They'll also get promoted across the website should they meet certain standards, which at the moment, are not as tough as the big three websites.
Cheers,
Dave