"I jumped on the plane and I told the physio 'I've had my first run, and my knee feels good'!"
It was Cooper's first run since he ruptured his anterior cruciate ligament in the bronze play-off in a disappointing finish to the Rugby World Cup in October.
The problem-free airport scramble, alongside potential No.10 replacement Mike Harris, has him on track for a potential round-seven comeback against the Brumbies at Suncorp Stadium on April 6.
It also has Cooper excited for the solo run in Cairns on Saturday, hours before the Reds have their first pre-season hit-out of 2012 against the Brumbies at Barlow Park.
"I'm really looking forward to it," the 23-year-old said. "I do I know that little jog through the airport would have helped.
"It's a big tick on the comeback trail for me - the end of basically all the hard little work you need to do to get the knee into a position to run."
A trim Cooper said he'd "flown through" his rehab compared to five seasons ago when his weight blew out to 100kg, feeding a belief he'll be able to slot straight back into action for the Reds.
As well as meeting his fitness goals, the 35-Test first five-eighths has been busy assisting five-eighth trialists Harris and Ben Lucas at Ballymore.
"He's been a great help - you can't keep him away from the place," Lucas said.