How many letters does the top answer for “located on the left side of a ship or aircraft” have?

The most common answer is larboard (8 letters).

Crossword clue: located on the left side of a ship or aircraft

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

larboard 8 letters wn-def

the left side of a ship or aircraft to someone who is aboard and facing the bow or nose

port 4 letters wn-def

a place (seaport or airport) where people and merchandise can enter or leave a country

located on the right side of a ship or aircraft 67% similar → starboard