Severe weather delays can cause backups if say there’s a storm in NYC and a lot of flights are waiting to take off for NYC and clogging the gates at an otherwise fine airport in Louisville.
When the plan takes off from Louisville, heading to Jacksonville, there is nothing in NYC to effect it getting there except weather, mechanical problems or an explosive crash into the ground! It is a short flight and gates in NYC have nothing to do with it.
In the end UPS did their job and it is on the truck for delivery today😛