Why Warren Buffett bet on the 'big 4' airlines against his own advice, then dumped them at a loss

**

· *Warren Buffett's Berkshire Hathaway sold its stakes in the "big four" US airlines at a loss in April, the famed investor revealed on Saturday.*
· *The Berkshire boss has been burnt by airlines before, and has warned of their dangers for more than 25 years.*
· *"Investors have poured money into a bottomless pit,...