Inspired by Daniel Campton in a forum post, I have added a new function into the aircraft photo update page (both member section and public quick upload).
When you type in a part of aircraft registry (4 characters or more), a list of possible aircraft will be displayed for you to choose from. Matching start from the very beginning of registry number. For example, enter "N123" will bring up first 10 registry start with "N123", but "1234" will only bring up registry with start with 1234, it will NOT bring up N1234 or N01234.
This function is still considered experimental as I haven't done much test yet. As always feedback is welcome.