I think that the rules say the opposite.
A
formation that is shooting gets crossfire. You only have to get
one unit into a crossfire position and the shooting from the
whole formation can claim the crossfire. Including those shooting units that were not in a crossfire position.
If that is the case then the aircraft (Tigershark) shooting does not claim the crossfire. The Gun Drones on the ground claim the crossfire. Therefore the formation has a crossfire and the target suffers the consequences. Because the combined formation fires as one then all units in the target formation count as in crossfire.
The positive response to the range stretching seems to run along exactly the same principles. Any unit in the formation is allocated hits if it is within range and LOS of at least one of the attacking units.
Quote:
4.1.1 Aerospace Formations
Aerospace units are organised into formations just like any other unit. However, although aerospace formations do receive Blast markers, they cannot be broken or suppressed. In addition, they can’t be assaulted, lend support to an assault or be used by another formation to claim a crossfire, etc., while in the air. Once landed, an aerospace unit may be assaulted and be used in a crossfire, and is affected by Blast markers normally.
Main rule says can't use an aircraft to draw a crossfire to (as opposed to from).
Quote:
4.1.1 Aerospace Formations
Q: Can you draw a Crossfire to or from an Aerospace formation?
A: Yes and No. An Aerospace formation in flight cannot claim a Crossfire bonus (see section 4.2.2) and it cannot be used by another formation to generate a Crossfire bonus (see section 4.1.1). But an Aerospace formation that was landed is considered to be a ground unit and could both claim the Crossfire bonus and also be used by other formations to generate the Crossfire bonus.
Clarification makes clear that an aerospace formation cannot claim a crossfire. Here the firing formation is NOT an aerospace formation; it includes landed Gun Drones who might or might not claim a crossfire.
As a more general comment. I understood that both the straight Tiger Shark formation and the Gun Drone formations were rare choices in peoples army lists. Part of putting them together was to give them a boost. Perhaps this "crossfire" boost is too much??? If so there are several options that might fit with my interpretation of the crossfire rule:
(1) Let the two formations fire separately. This could be exactly like a coordinated fire mission where they both have to fire at the same target formation. It would put a second blast-marker on the target but the aircraft shooting (as a separate formation) would not get crossfire AND the Gun Drones would not benefit from range stretching.
(2) Make another special rule that says one/two unit(s) (the aircraft) in the formation shooting must be tracked separately and the crossfire benefits do not apply to that.
(3) More thought required, but since I like (1), . . .