I love planes,
ARF, which usually just means an airframe with no electronics. Could mean pre-built or requiring alot of assembly.
RTF, obvious, ready to go
Rx ready...just add your radio/reciever
TX ready...or BNF (bind and fly)
Kit, like a ARF but requires 100% assembly as well as electronics.



While some models its hard to tell how complete they are or what they need, it is nice to have the options. There are more than a few RTR ground models I would like to see in Kit or ARR form. Especially since there are many "low cost" brushless and radio systems out now.