09/01
CMF was closed for most of Saturday due to heavy snowfall, as with other airport websites, most flights there were either diverted and/or rescheduled/cancelled.
LYS didn't have the handling capabilities for the volume of aircraft that had diverted there from CMF so some were turned away - hence the CWL flight returning.
10/01
I believe there is still an issue with heavy snowfall at CMF but the airport is open and operating at limited capacity; flights are departing to there - whether they get there or not is a different story! And why via MXP, I don't know!?!
PP