Ok, I'm not the only one. For the most part the gate-to-gate timeline is extremely predictable. They already have the clearances set up and know what route th

Ok, I'm not the only one. For the most part the gate-to-gate timeline is extremely predictable. They already have the clearances set up and know what route they're flying so the flying bit is not really going to change much outside of unforeseen weather or traffic delays. The variable part is loading, unloading, and staffing issues (someone didn't make it to work) and occasionally absorbing the impact of flight delays. I suspect the net effect is actually a decrease in CO2 emission because the delay stack at the end of the day doesn't force pilots to bump the throttles a little to cut some time on flights with lots of connections as I've seen them do before.