Jerry I would read the numbers again. The first thing you have to do is add back in the 1.1 billion paid in profit sharing. 4.5 billion was the profit after deducting the 1.1 billion. That means you need to base your number on at least 5.6 billion. If I recall there were other items that brought the PTIX number up to 6.7 billion or so but that's off the top of my head. There are other things that could push that number higher. If the actual PTIX profit was 4.5 billion then the profit sharing for 2014 would have been 750 million not 1.1 billion.
From the 2014 earnings report:

2014 results include $1.1 billion in profit sharing expense, including $262 million in the December quarter, recognizing Delta employees' contributions toward meeting the company's financial goals.