That's a new one for me...

"Online Checkin is not available on your flight
We apologize but your booking has too many flights to be displayed. To check in and receive your boarding pass, please proceed to the airport."

I blame AA for multiple timetable changes - the booking in MMB is currently showing nineteen flights (eleven of which have been cancelled), with over two thousand tier points and nigh on seventy thousand avios.

Ho hum. Off to AMS checkin early tomorrow, to be shouted at, I guess.