United 777 plane flew fewer than half of flights allowed between checks -NTSB US, South Korea reach agreement on defense cost-sharing San Francisco to reopen in-person classes for youngest students COVAX delivers over 20m doses of COVID-19 vaccines to 20 countries: WHO NY officials removed fuller tally of nursing home deaths Senate finally takes up $1.9t relief package US, Britain announce 4-month tariff suspension in aircraft subsidy dispute NASA's Perseverance rover performs first drive on Mars Brussels seeks help from Washington for more jabs Biden adds Big Tech critic Tim Wu to his economic staff Situation in Brazil 'very concerning', says WHO chief US infrastructure needs $6 trillion in fixes, say engineers Dominica receives China-donated COVID-19 vaccines Space station crew conduct spacewalk to install solar array modification kits US lawmaker sues Trump over Jan 6 Capitol riot Relief bill survives marathon to advance Cuba's Soberana 02 COVID-19 vaccine starts phase 3 trials US anti-Asian violence spurs volunteer patrols Meatless products hit stride in US