In monitoring newly accepted photos in the database, I keep finding errors in people's submissions that could have been avoided if they had used autofill. When submitting a photo, first type in the registration of the aircraft and/or the airfield identifier at the top of the screen and click on "Get Info". Autofill will check the a.net database and attempt to fill in the appropriate information further down the screen. Auto fill is not perfect, but it gets you a long ways there. Use a little common sense if it provides you obviously wrong info. For example, last night I submitted a picture of a Nanchang CJ-6A registered C-FGCJ. Autofill identified this as a 737, as this was the previous use of the registration. I changed the appropriate fields to correct the information. If auto fill provides something that you don't think is right and you are reluctant to stick your neck out and change it, include a message to the screeners in your submission.
I would encourage people to research what they are submitting. Search for the registration in Google and see what you get. Consult the FAA database for US registered aircraft : http://registry.faa.gov/aircraftinquiry/ or for other registrations, see if databases are available at www.landings.com (go down to the bottom of the page and click on "Databases"). For military aircraft, consult Scramble: http://www.scramble.nl/milbase.htm For US military aircraft, double check with Joe Baugher's lists: http://home.att.net/~jbaugher/. If its a helicopter, check Rotorspot: http://www.geocities.com/rotorspot/historic.htm or this site: http://www30.brinkster.com/ukcopter/frames/master.html. For airliners, there are great database spreadsheets available at www.airlinerlist.com.
Also, look at the a.net database to see how aircraft of this type are identified. Put effort into understanding what you took a picture of. If you are really uncertain what to do, e-mail me at: email@example.com