Aeroplan.com shows different flight schedule than AC.com or ITA
Looking at YUL-MUC on 12/8:
Aeroplan.com shows LH475 leaving at 20:20, while AC.com shows AC9098 (same flight as code share) leaving at 17:55, which seems to be the correct time. (ITA shows 17:55 for LH475.)
Why would there be such a discrepancy?