What is the boarding process at Southwest Airlines
Southwest Airlines offers a unique boarding process where the passenger is not given a specific seat, they are instead boarded in the order that they checked-in for the flight.  Passengers are given the opportunity to upgrade their ticket, either through a loyalty program (Southwest Rewards) or by purchasing an Early Bird Check-In for a fee.
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(Optional) Context information is below.
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Answer the following query.
What is the boarding process at Southwest Airlines

user
Southwest Airlines offers a unique boarding process where the passenger is not given a specific seat, they are instead boarded in the order that they checked-in for the flight.  Passengers are given the opportunity to upgrade their ticket, either through a loyalty program (Southwest Rewards) or by purchasing an Early Bird Check-In for a fee.
assistant