It had just taken off correct? It would have been fully laden w/unburnt jet fuel, thousands of pounds of it.
Not familiar w/the term 'e tanks', the one in the McD's pic is just a standard medical oxygen tank. Agree, it's top is popped, whether that's a cause or result of the impact suffered, can't make any determination from the pic. Oxygen, in contact w/fuel/oil will immediately cause detonation. Breathing oxygen is one of the most dangerously benign things we have just hanging around.
11,000 feet per minute is equal to approximately 125 miles per hour.