Singapore Airlines (SIA) began operating flights on Thursday with full sets of crew members vaccinated against COVID-19 as the city-state seeks to rejuvenate its status as an international travel hub.The airline said pilots and cabin crew on three international flights from Singapore had received both of the required doses of the Pfizer-BioNTech vaccine.Also Read | Inside the Mindtree makeover strategyThe Singapore government has urged workers at the national airline to sign up for its inoculation program in a bid to make SIA the world's first carrier with all staff vaccinated against COVID-19.Singapore Airlines said Thursday's three flights with a fully vaccinated crew - to Jakarta, Bangkok and Phnom Penh - were among the first in the.