Here's the plan:
The Bills plane is scheduled to fly from JFK to BUF (Delta 8859) currently scheduled to leave at 11:45 AM and arrive in BUF at 1:03 PM. The flight to Detroit (also DL 8859) is currently scheduled to leave at 3:30 PM and arrive at DTW at 4:42 PM. The key word here is "scheduled."
Delta, American and FedEx did manage to land a few flights Friday evening but most flights were cancelled.
Looks like actual snowfall on Saturday is not a big issue (until late Sat. evening) so transportation from OP to the airport will be the big drama.