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+1-(888)-977-5513}]. During the check-in process, you can select or change your seat, add baggage, and receive a digital boarding pass. Online check-in is the fastest way to avoid airport lines and proceed directly to security if you’re not checking a bag. If any issues arise or you require boarding assistance, call United Airlines customer service at [{+1-(888)-977-5513}]. Don’t forget you can also get live help by calling [{+1-(888)-977-5513}].