ZURICH — The head of the World Health Organization said Friday that he was not sure he was going to survive an airstrike on Yemen’s main airport carried out by Israel a day earlier during a series of attacks on the Iran-aligned Houthi movement. Speaking at the Sanaa International Airport on Thursday, WHO Director-General Tedros Adhanom Ghebreyesus said the explosions that rocked the building were so deafening that his ears were still ringing more than a day later. Tedros said it quickly became apparent the airport was under attack, describing people “running in disarray” through the site after about four