LTU International was an airline that operated from 1955 to 2009 out of Düsseldorf until a merger with Air Berlin (R.I.P.). The MD-11 was operated in their fleet from 1991 to 1998 on routes from Düsseldorf to destinations such as Izmir, Puerto Plana, and Punta Cana. There were 4 aircraft of this type in their fleet. This specific aircraft (D-AERB) later served Swiss, Air Namibia, and currently flies for UPS as N283UP.
This aircraft has a very unique and colorful livery and history, and as such I feel it would be well-represented in Infinite Flight, especially seeing as the aircraft itself is still flying.
Disclaimer: I’m not sure if the mods closed the old thread yet, but I did get permission to make a new one.
Photo credits: Pedro Aragao via wikimedia (https://commons.m.wikimedia.org/wiki/File:LTU_McDonnell_Douglas_MD-11_Aragao.jpg) via airliners.net (http://www.airliners.net/photo/LTU---Lufttransport-Unternehmen/McDonnell-Douglas-MD-11/0985070/L)