They were identified as Aerostar YAK-52TW VH-POW, North American Aviation T-28B Trojan VH-RPX and Nanchang CJ-6A VH-TWF.
On Tuesday 14 July, at least two of the three warbirds were noted departing Watts Bridge Airfield and landing at Roma Airport for fuel. They then continued to Charleville Airport where they spent the night.
Then on Wednesday 15 July, all three warbirds departed Charleville Airport and were photographed above arriving in formation into Longreach Airport.
They then reportedly continued to Winton Airport, but as mentioned, their final destination is unknown.
UPDATE! On Monday 27 July, the Aerostar YAK-52TW VH-POW was noted departing Gladstone Airport for Watts Bridge.