1. having already boarded or been loaded onto a vehicle, aircraft, or vessel before a specified time
Usage: commonly used in aviation and transportation contexts

1. past tense and past participle of 'preboard'; to board a vehicle, aircraft, or vessel in advance of the general boarding process
Usage: transitive verb; aviation and transportation

Examples

• Passengers with mobility issues were preboarded before the general boarding announcement.
• The airline preboarded families with young children to allow extra time for settling in.
• We preboarded the ship an hour early to secure the best cabin locations.
• First-class passengers were preboarded while economy passengers waited at the gate.
• The flight attendant called for preboarded passengers to take their seats.
• They preboarded the bus with elderly passengers to ensure their comfort.
• Preboarded luggage was already stowed in the overhead compartments.