At Concourse C at BWI, there are multiple ways to check in with United Airlines BWI Terminal. Travelers have three options for checking in: the United app on their phone, self-service kiosks, or traditional in-person check-in at the counters. There are enough counters in the roomy check-in area to accommodate the volume of passengers that United Airlines services. Concourse C's security checkpoint is efficiently run, and eligible passengers can use the TSA PreCheck lanes. Although security wait times are usually acceptable, it's still a good idea to arrive early, especially during periods of high travel demand, just as at any other big airport.