Thanks to user report, we noticed that our billing module had crashed some days ago. This meant that the weekly credits billings were not done during the last days. The error is now fixed and billing is running normally again.
Due to the error some of you may have received some "free" play time. For example in one case the previous weekly billing for a game world was 24th March, next was supposed to be 31st March but it never happened due to the error, and now the single weekly billing has been made on 6th April (with next being on 13th April) - giving basically week's worth of free ride. Since the error was at our end and "our fault", and anyway only a minor one, and in all cases was in your benefit (= taking out less Credits than it should), we are not checking the differences and are granting the possible free play time as a "gift".
You may see your billing history from the following page (if you wish to be sure it's all OK).http://www.airwaysim.com/Profile/History/