The White House is working on a COVID-19 vaccine passport initiative that could be required for travel, sporting events and even eating out, reports The Washington Post. The report comes as major U.S. airlines and nearly 30 travel and labor groups are pushing President Joe Biden to develop a standardized, government-backed credential to "accelerate safe economic activity and recovery." "The U.S. must be a leader in this development," the groups wrote in a letter to COVID-19 Recovery Team Coordinator Jeff Zients on Monday. "The current diverse and fragmented digital health credentials used to implement different countries' air travel testing requirements...