Thank you both. I'm aware of the different rules about arriving this time for domestic, this time for int'l...
What I'm looking for is to determine whether that first leg is considered domestic or int'l.
So (and again, I'm not looking for advise that I should play it safe and get there earlier - I am referring to a specific scenario),
if I am flying from AUS to PHL (Domestic) to YQB (Int'l), do I have to check in my bags at AUS 60 minutes in advance per Int'l rules
or 45 minutes in advance per domestic rules?