WELLINGTON, New Zealand—The first flights carrying fresh water and other aid to Tonga finally arrived Thursday after the Pacific nation’s main airport runway was cleared of ash left by a huge volcanic eruption. New Zealand and Australia each sent military transport planes that were carrying water containers, kits for temporary shelters, generators, hygiene supplies and communications equipment. The Australian plane also had a special sweeper to help keep the runway clear. The deliveries were dropped off without the military personnel coming in contact with people at the airport in Tonga. That’s because Tonga is desperate to make sure foreigners don’t bring in the coronavirus. It has not had any outbreaks of COVID-19 and has reported just a single case since the pandemic began. Rear Adm. James Gilmour, the commander of New Zealand’s Joint Forces, said there had been a “mammoth effort” by Tongan troops “to clear that runway by hand. …