I'm doing a fun trip over thanksgiving in business class as was wondering where I would get stamps for my passport

ORD-AMS on KL (layover 10 hours)
AMS-ATH on KL (3 days)
ATH-PRG on OK (1.5 days)
PRG-CDG on AF (layover 2 hours)
CDG-DTW-ORD on NW

Thanks