What is your favorite aircraft? I'll split it up into categories to try to keep it manageable. Don't get too hung up on them as I know many modern millitary aircraft are multi-role platforms. Just go with what the aircraft is mostly known for.
1) Millitary - WWII
Fighter
Bomber
Other
2) Millitary - Jet Age
Fighter
Bomber
Ground Attack
Navy aircraft
Other
3) Commercial Aircraft
4) General Aviation