Dear groupAfter installing two new airports ( RKSI Incheon wing city airport &KBOS Boston Logan Int'l ) I am just wondering what I have to tweak to avoid sitting on the grass instead of runways.Thanks in advance.

I guess you need another AFCAD file for these airports.Try to read the readme files.Cees

Thanks for your input Cees.and I forgot to mention that it happens only when I use flight planscreated by FSNavigator.Mine is registered version 4.6after installing those 2 airports above, airplane always sit on the grassinstead of runways.Thanks in advance.