Useful idea, especially for separate tickets. I’d treat the result as a risk score rather than a yes/no answer.

The variables that usually change my decision are:

• checked bag vs carry-on only
• same alliance / same terminal vs terminal change
• immigration/security re-clearance
• historical delay pattern of the inbound flight
• last acceptable arrival time, not just scheduled connection time

For separate tickets I generally want the tool to show the assumptions very clearly. A 75-minute connection can be fine at one airport and a bad idea at another, so the “why” behind the score matters more than the label itself.

DP: I’m more conservative when there is any bag re-check or immigration step involved. Carry-on only, same terminal, and a later backup flight changes the calculation quite a bit.

Good start though. I’d use something like this as a sanity check before booking.