Police pulled a handcuffed Pro Football Hall of Famer Terrell Davis off a plane after an incident, Saturday. Three days later, United Airlines issued an apology. The airline released a statement, Tuesday,saying: “This is clearly not the kind of travel experience we strive to provide, and we have reached out to Mr. Davis’s team to apologize. We have removed the flight attendant from duty while we closely review this matter.” Terrell Davis, who helped win a Super Bowl for the Broncos, brought attention to the incident by using social media. He described what happened on a flight from Denver to t…