From my understanding, the hierarchy at the check-in counter is base employee < supervisor < manager. The supervisor is typically around the check-in counter, but I don't know about the manager. What is the process to raise a complaint to the manager at the check-in counter, regarding some issues that happened at the check-in counter? Assume that the supervisor refuses to connect to the manager.
If specific to the airline, I'm currently interested in Qatar Airways. If specific to the airport, I'm currently interested in SFO.