the only somewhat working pure east front setup at the moment are the two east front plane sets comming with ETO_01.
To use them, go to the configuration screen and select "Planeset3" (early) or "Planeset4" (late east front).
Since we dont have a real east front worldsetup a late war frontline setup(east front close to Berlin) get used.
If you want to have some more east front fun, give the very good Finnish Airwar a go. The FAW world is outstanding, with help of the FAW manager you can play many historical correct misssion.
1st engined flight by Richard Pearse, Waitohi, New Zealand, March 31, 1902. Karl Jatho, 1st flight, 18.August 1903, Hannover-Vahrenheide, real controlled flights.
The Wrights, 1st flight, 17. December 1903. They wasnt the 1st, but still claim this!