Yes, United Airlines offers a boarding group feature. This system helps passengers board their flights in an easy way. Also, United boarding groups: passengers are placed into seven groups, which are listed in the points below.
There is a pre-boarding group.
Groups 1, 2 and 3.
Groups 4 and 5.
Group 6.
For information, about the boarding groups of United Airlines travelers can read the blog post published by Group Travel Airlines.
Read More: https://grouptravelairline.wixsite.com/flights/post/united-airlines-boarding-groups-a-complete-guide