25.3% Al and 74.7% Fe2O3 is also cool, and I wonder if they could had had "naturally occurring" thermite in the mix with Al-H2O.
Look at your own stated ratio of 25%AL to 75%Fe.
Powdered metals are highly reactive but you have to work to get the ratios and ignition correct. Water dumped on molten AL or FE or ZN or Pb turns to steam VIOLENTLY hence “explosions” of trapped water. There are plenty of items in the building/plane combo that create explosions of all sorts but these are kinda trivial compared to thousands of gallons of wind-fed JP4 weakening steel past the yield point.