Two related questions: 1. is it possible to declare a coordinated airborne deployment? (I assume yes) 2. do models that declare a coordinated airborne deployment retain their regular/irregular orders? (in N3 the answer was no, but I believe we've recently had clarification regarding N4 impetuous airborne deployment confirming that e.g. Duroc does not lose his irregular order if he deploys using his impetuous order, which if applied consistently might mean the old N3 ruling doesn't apply this edition)
It seems to me the answer to 1 is "no". It seems like the order the trooper enters the table with when Combat Jumping is their own order. I also note that a Hidden Deployment trooper is specifically called out to be able to participate in a Coordinated Order - and that they lose their own order if they do so.
The two previous threads: https://forum.corvusbelli.com/threads/coordinated-combat-jump.38052/ https://forum.corvusbelli.com/threads/ad-and-off-the-board-orders.38017/#post-368260 In particular, see IJW’s statement at the end of the second link.