Talk:Bf 109 G-10/@comment-80.116.128.149-20150923173724/@comment-25370154-20150923191215

No worries here.

Special Aircrafts, which can be recognized by icons like, and , cannot go beyond lvl.10 unless you use that Module.

That increases the Max lvl. by one, meaning the chosen aircraft will be able to reach lvl.11.

To summarize:

Special Aircraft reaches lvl.10 → Buy last Upgrade → Use Special Module → Begin researching lvl.11 → Purchase new level → Use another Special Module → Unlock next level.