> Not a word was spoken, we learned something new here: different cultures, different emphasis. Even if you return the favor, asking for ride to airport is reserved for very strong relationships!

I'm an American who never seems to be able to understand cultural norms. Is this a thing? Is driving people to the airport that big a deal? If I need a ride to the airport, I always just ask around. I am always ready to drive people to the airport (or anywhere) as I went without a car for a few years and greatly appreciated every ride I got.