Travel Industry not happy with UK green list and believe it does not go far enough [BBC] Why is the US not on the green list?

Travel Industry not happy with UK green list and believe it does not go far enough. " But easyJet has said the timetable "simply isn't ambitious enough". The airline said the announcement, which followed days of pressure from the travel industry, was "not the safe and sustainable reopening of travel the government promised"." BBC https://www.bbc.co.uk/news/uk-57606348