air china may not deliberately to confuse you,

But I think German airline does. We all know what the german are like, they would not make mistake easily.

My friend was victim of this. After coming back, he wrote to german airline customer service, threated to take legal action.

German said they had done nothing wrong, it was up to passengers themselves to work out the rules. But they gave my friend 100 pound
Good wish money. End of the day, airlines do kind of service business, keeping customers happy are important .