Summerside Airport — Slemon Park, Canada

Summerside Airport, coded YSU, serves Prince Edward Island's second-largest city and sits on the site of a former Canadian Forces Base that once housed CF-100 and later Aurora patrol aircraft squadrons. Today YSU supports general aviation, flight training, and the Slemon Park aerospace industrial park, which has repurposed former military infrastructure for aircraft maintenance and manufacturing businesses. Summerside's economy benefits from this aviation heritage alongside agriculture and tourism tied to the island's famous red-sand beaches and Anne of Green Gables lore. YSU's long runway, a legacy of its military past, gives it capacity well beyond typical regional airports of similar size.