Reading GLSNightPilot's post, its obvious he was on duty that night. Its obvious that there was a delay in launching the PHI night ship of approximately one hour. I'm sure that's all quite well documented.
I assume there were no mechanical problems delaying the launch, so that leaves some kind of dispatch delay.
It would be interesting to see if PHI actually billed ERA for the night flight.
Substantiating a dispatch delay will neccessitate recollections of phone conversations. I seriously doubt that PHI's management will admit to it - same with ERA. It makes both companies look bad.
So it comes back to the question of why did GLSNightPilot wait an hour before launching when he was ready to go.