It's not rocket science (that's a joke.)
load object "phoenix1.x", 1
load object "phoenix1_wing.x", 2
ghost object on 2
There is more that you can do to tweak the appearance of the wing models as well.
In the demo code I was playing with, I did this.
set normalization on
load object "test_jet.x", 1
set object light 1, 1
set object transparency 1, 0
SET OBJECT SMOOTHING 1, smoothPercentage
load object "test_wing.x", 2
set object light 2, 1
set object transparency 2, 0
SET OBJECT SMOOTHING 2, smoothPercentage
ghost object on 2
Jet and wing were exported to the same scale from DoGA so they would match up. I used an export scale value of .1, but you can use what you want as long as you're consistent.
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TAZ