preboard

/priːˈbɔːrd/
verb
  1. To board a vehicle (such as an airplane, train, or bus) before the general public, often for passengers who need extra time or assistance.
    • We arrived early so we could preboard the train and find our seats.
    • The airline lets passengers with disabilities preboard to get settled.
    • Families with young children are allowed to preboard the flight.
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