AirReg
Lookup airplane details by entering its registration "number".
This software is also available for off-line use:
by Yours Truly
Like the online version it will first try Airport-data.com's API to lookup the registraion, but unlike the online version, it can also use add-ons for locally stored databases.
The desire to fly is an idea handed down to us by our ancestors who, in their grueling travels across trackless lands in prehistoric times, looked enviously on the birds soaring freely through space, at full speed, above all obstacles, on the infinite highway of the air.
Wilbur Wright