> I'm not sure if the tool specifically accounts for that or if the math just ends up working out, but I was testing with various combinations of my family and it always ended up at someone's home airport.

Not sure. But if you put the two locations of Caracas, VE and San Francisco, US, they suggest meeting in Houston, US.

Does it make sense? Is it more environmental friendly for two people to meet in the middle rather than having one person staying and the other going there? My gut says the latter should be more environmental friendly.