What is United Airlines shortcut?
Bag drop shortcut
This drop-and-go service lets you check your bags faster. First, check a bag during check-in on united.com or the United app. Then, drop your bag in the bag drop shortcut area at the airport.
https://s3.amazonaws.com/travel-support/United+Airlines+Customers+Support+for+Immediate+Help.html
https://s3.amazonaws.com/travel-support/United+Airlines+Customers+Support+for+Immediate+Help.html