We get many questions regarding airport connection times. Especially from people with two separate tickets.
In many cases, they want to know if they can book an earlier flight or a late flight.
I don't book separate tickets for the same day. Too many variables. But I have done the following and it has worked a few times:
Let's say I book a flight for 3 PM. But there is also a flight leaving at Noon. My arriving plane was early and I could have made the earlier flight.
My suggestion.....go to the gate of that earlier flight and ask if you can get on it. You'll either hear "yes" or "no." There are other variables such as change fees, differences in fares, and the like. But the worse they can do is say "no."
This will work only if you have carry on luggage. Checked luggage would be too difficult to find and reroute.
Remember the old saying...."If you don't ask, you don't get."