Yes, one of the hallmark perks of flying in First Class or a premium cabin is the Pre-Departure Beverage (PDB) service. Once you are seated, and while the rest of the plane is still boarding, flight attendants typically offer a choice of water, orange juice, or sparkling wine/champagne. This service is designed to help premium passengers relax immediately upon boarding. However, PDB service is not always guaranteed; it can be cancelled if the boarding process is rushed, if there are security delays, or if the flight is extremely short. Additionally, on some domestic U.S. flights, the "First Class" drink service may be limited to water or coffee during the boarding phase due to local catering regulations or short ground times, with the full bar service beginning only once the aircraft reaches cruising altitude.