In Ireland, everyone thinks it's pretty ridiculous that there's no train to Dublin Airport (all going well, it will finally have one in 2036 or so, after _many_ false starts). Dublin's a city of about 1.5 million people. It's pretty incomprehensible that a city ten times the size wouldn't have one.
EDIT: Oh, wait, misread, I thought you meant a direct train from Grand Central to the airport.
It’s a single, low-bullshit transfer. Frankfurt Airport also requires a connection for terminals 2 and 3 [1].
[1] https://www.frankfurt-airport.com/en/transport-and-parking/t...