A potentially telling revelation in the wake of the Asiana Airlines crash landing at the San Francisco airport: Asiana pilots have little training on manual flying and visual approaches, according to three pilots Bloomberg spoke to who have either flown for Asiana or helped train Korean crews. One of the three recalls preparing to land an Asiana jet at LAX and asking his Korean co-pilot to make a visual approach. The co-pilot couldn't do it, forcing the American captain to take over in order to avoid an accident. The co-pilot's explanation to him afterward: "I don't need to know this....