I just found some typos in airport names..
Airport PUS - In game written "Gimahe" - real name is "Gimhae"
Airport AGB - In game written "Ausburg" - real name is "Augsburg"
Airport NRN - In game written "Neiderrhein" - real name is "Niederrhein"
And by the way, the airport FRA - Frankfurt is not in Rheinland-Pfalz, it is located in Hessen. The other Frankfurt called Airport, HHN is located in Rheinland-Pfalz, thats correct.