Hello Samiiiii!
As roughly detailed in this thread about the 767-200SF (https://www.airwaysim.com/forum/index.php/topic,76859.0.html (https://www.airwaysim.com/forum/index.php/topic,76859.0.html)
The 767-200A could be "converted" into an "ER" spec'd 159 MTOW bird by making use of the dry center bay for fuel and uprating the engines. Histoically, this was done by several airlines that include: AA, TW and UA. https://rzjets.net/aircraft/?parentid=11&typeid=59&frstatus=3 (https://rzjets.net/aircraft/?parentid=11&typeid=59&frstatus=3)
QuoteN312AA Boeing 767-223 22315 94 CF6-80A2 ABX Air (Cargo Aircraft Management Inc.) 1984 KMAJ
leased 10/15 A34E40
vN312AA rg 07/21/15 (Cargo Aircraft Management Inc.)
C-GCJO rg 07/15/14 603 Cargojet Airways (Cargo Aircraft Management Inc.)
N312AA leased 1/11 Air Transport International (Cargo Aircraft Management Inc.)
N312AA leased 11/08, rg 12/30/09 Cargo Aircraft Management Inc. Orlando FL lrf 12/26/10 ABX Air (Aircraft One) KMAJ
N312AA bought 12/9/05 (Aircraft One)
N312AA dd 6/11/84, rg 2/13/85 American Airlines - converted to ER 312 American Airlines ELBM
N312AA ff 5/22/84 The Boeing Company
converted to Bedek freighter 11/08
Thus I request that all 767-200A/non-ERs be able to be converted into a 767-200ER (159tn MTOW) version. Looks like starting in 1985.
Talentz
Well, we could extend this ability to other airliners like I requested some time ago (https://www.airwaysim.com/forum/index.php/topic,75419.msg442104.html#msg442104), as MTOW change isn't a possibility exclusive for 767s.