After the latest update (version 1.45) an exclamation mark did appear on the "settings" icon in the main screen. I can't find what it points to. I have entered all of the submenus in the settings screen but this icon doesn't disappear from the main screen. I've thought that it was there to inform about the new aircraft and began to collect the pink parts but it didn't change anything either.
Best Answer
Infinite Dreams must be watching this tag here on Arqade :) They've just released an update which solved this problem.