They correspond roughly to small municipal, medium-sized metropolitan and major metropolitan airports respectively, and encompass an increasingly rigorous set of regulations.
South Dakota's voters rejected stringent restrictions on abortion that had been passed by the legislature and which anti-abortion advocates were hoping would provide a test case in the Supreme Court.
Chains such as KFC, McDonald's and Pizza Hut are setting a new standard of customer service, using strict employee training and constant monitoring to ensure the friendliness of frontline staff.
It was clear after the incident that, while she may have answered truthfully in the strictest sense of the word, Sheryl was actually trying to delude Sergei.