I`m not speculating either....too soon to do that, however. I recall that the DC9 and in the Mad Dog, when de-icing was selected. every so often (15 minutes, I think) the de-icing would shift to the tail and when it was turned off, it automatically deiced the tail again. Another observation...the 400 wing looks way too small. I know new planes have smaller and smaller wings due to computer designs plus some magic thrown in...wonder what the wing loading on the -400 is?