The flight schedules only allow for 3-character codes for "Equipment type" used on the flight (prob a throwback to older computer systems). Often the last character is substituded with another to indicate the series or variant of aircraft used. For example "737" is used for the original 737-200 series, while you'll also see things like "738" for a 737-800 series.

"767" usually means 767-200, while "763" would indicate 767-300. "744" is a 747-400 and so on. Same goes for Airbuses, so a "343" is an A340-300.

FewMiles..

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FlyerTalkers' Resources on the Web: http://home.webflyer.com/fewmiles/
Unofficial Guide to AAdvantage: http://home.webflyer.com/fewmiles/AA/
oneworld comparison chart 2001: coming soon