United Airlines flies from Shanghai Pudong International Airport to San Antonio International Airport. Make a stopover at Los Angeles International Airport.

Two and a half hours is really tight. I have been to Los Angeles twice and didn't continue carpooling. I can only try to give you some advice.

1, connected in LA, so you need to go in and out of LA to continue the connection. The waiting time for immigration and customs to go through immigration formalities is generally half an hour to one hour. My experience is that you should queue up at the door of the cabin as soon as possible after the plane lands, so that the entry queue can be at the forefront, which can minimize the waiting time for entry, or if the queue time is long, you can tell the staff that you have a connecting flight staff to help you arrange it.

2. Los Angeles Airport is really big. You can check LAX official website to see if there is any arrival and departure information of United International. After successful entry, ask the staff how to get there.

If the next flight is delayed, don't show your boarding row to United staff. They can help you arrange the next flight to Saturday. Domestic air tickets in the United States are valid for one year.