767-300 aircraft are ER
configuration and 180 minute ETOPS certified. Some of them are low gross weight models with derated 52,000 lb engines and 360,000 lb MTOGW. These aircraft are two class and fly domestic and Hawaii. The three class aircraft have 60,000 lb motors, gross at 407,000 lb and fly mostly international Atlantic. Systemswise, these aircraft are pretty much identical. The engines are interchangeable and "dialed back" for the low gross use. The engines are also used on the 747-400 at 56,000 lb.
767's have been downrated from 'ER
Some 767-200 aircraft have been recently removed from ETOPS status, not ER
configuration. These aircraft are used solely for domestic operations with a very occasional equipment substitution to London. Lack of proper VHF radios prevented them from going further east than LHR
. They were (are) scheduled to go to Victorville and were removed from ETOPS status pending the final grounding.
Hope this helps.