British Airways operate at terminals 3 and 5 and have ticket counters at Terminal 5.
Passengers can check in online or using the mobile app 24 hours before the flight, or at the airport using self-service kiosks or check-in counters. Travelers should check-in at least 60 minutes before the trip.
British Airways has codeshare flights with American Airlines, Envoy Air, SkyWest Airlines, PSA Airlines, Aer Lingus, Iberia, Finnair, and Air Italy.
Phone number of British Airways: 1-800-247-9297
Official Website: http://www.britishairways.com/travel/home/public/en_us