They Hi-Jack Q's tripcode.
Then Hi-Jack a Q400 (and crash)
Message is they will 'Hi-Jack and kill the Q movement etc.
Furthermore:
→
Hijack happened in Seattle – the same place the Missile was launched from post G7.
Pilot clearly under MC.
→
If the plane was to be used as a weapon its target must of been within the state – they knew it had no hope of travelling far before MIL response.