American Airlines is closing its San Francisco base, potentially displacing 400 flight attendants. Two-thirds have worked for the airline for 13 years or more, according to union calculations. 10 flight attendants told Insider a myriad of factors make it difficult to leave the Bay Area. The mass email hit some flight attendants' inboxes mid-flight. "Today it's with great regret that I let you know about our decision to close the SFO flight attendant base," American Airlines executive Brady Byrnes said in the September memo obtained by Insider. In closing its San Francisco base, citing economic factors and shifting customer demand,...