Found in the following dictionaries
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Preboard" Definition
verb-transitive
To allow (one or more passengers) to board ahead of the regular time or before other passengers.
Source: American Heritage Dictionary
To board (an aircraft, for example) ahead of the regular time or before other passengers.
Source: American Heritage Dictionary
verb-intransitive
To board an aircraft or other conveyance ahead of the regular time or before other passengers.
Source: American Heritage Dictionary
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