By Connie Bowker A flight in China was cancelled, leaving 300 passengers fuming, after a couple demanded their toddler be upgraded to first class for free. The parents had bought two first-class tickets for themselves and an economy ticket for their child, but insisted the child should join them in first class at no extra cost. The dad confronted the staff, demanding his son be moved to first class without paying more. He argued that since he had already paid for two first-class seats, he should get a third one for free. Footage taken by a passenger shows the angry dad arguing with crew member…