Sorry TL, I haven't got 4D yet.
Planes?? I've got 10 of the 12 (only 5 clues left to finish) and I haven't seen a plane yet!! The 'adjustments' I've made have been consecutive letters, none of which gives me anything other than leaving the only possible shortened words to enter in the grid. Can you give a hint without spoiling it for others? eg. 26A, I've removed the 3rd to 5th letters but Google doesn't help with it.