Sure, you own the copyright to your images but you also gave FlightAware an unlimited license to use your photos, however they wish, when you uploaded them. They own the rights to the images you uploaded to their site. From the FlightAware Ten Commandments (TOS):
“You grant FlightAware a worldwide, royalty-free, unlimited, irrevocable license to use, transmit, distribute, and sell any submitted photography or media content.”
FA doesn’t have any responsibility to do anything to protect “your” photos on their site. If they don’t care what happens to the copies you licensed to them then… oh well… not much you can do about it. I personally don’t have any problem with FA’s licensing and policies but I think a lot of folks just don’t understand the implications.
If you believe that there’s any kind of intrinsic (or monetary) value to your photos then don’t provide any thieves with the chance to steal them. If you don’t like third parties like FA owning rights to your photos and allowing them to be distributed without your consent then don’t give them an unlimited license to use them. FWIW, any photos that I upload for public viewing on the internet carry fair use rights in the EXIF. They’re just for everyone’s enjoyment, feel free to share them. Any of my photos that I feel have value and I don’t want stolen only get uploaded to pass-worded client proofing galleries with my copyright spelled out in the EXIF.