 ABC News. Some elective surgeries at hospitals are being canceled. Britain's National Health Service also affected. Some airlines slowly coming back online, but passengers should expect cancellations and delays all day. This is ABC News. I'm Kareem Abdul-Jabbar. I learned about atrial fibrillation the hard way. My symptoms would come and go. Shortness of breath, fatigue. I kept going. Then I got so lightheaded, I couldn't. My doctor said I have AFib, so I'm about five times more likely to have a stroke.