Originally Posted by
ScienceTeacher
If the plane were to offload in Canada, what would happen to a passenger that isn’t allowed into Canada? Held airside until suitable provisions are made?
Immigration officials have discretionary powers to granted leave of entry if appropriate. It might well involve passports being held. Alternatively being held airside is an option.
Canada requires either an ETA or visa for almost all nationalities so I'm sure CBSA have a procedure for handling this.