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Soft landing via road Cornwall Ontario

I am from Boston and planning to do soft landing at Cornwall Ontario. After border crossing I plan to spend weekend in Montreal Quebec and return back to Boston on Sunday. I have travelled to Montreal,Quebec from Boston before but it seems I can not do soft landing in Quebec border so I am planning to take detour to Cornwall Ontario,do soft landing, spend weekend in Montreal and back to Boston.
The two questions I have:
1> Is there something special about Cornwall Ontario soft landing?
2> is getting return flight from Montreal,Quebec an issue?