Here is their spin:
The Australian International Airshow 2015 will pay tribute to Anzac and the heroes of military aviation. It will be the major theme of the event and as such it will be the first significant observance of the Gallipoli campaign in its centenary year. It promises to be a once-in-a-lifetime aviation spectacular. It will feature an emotional and moving tribute to our brave aviators, the heroes of the sky over the past 100 years, from Gallipoli to the present day.

Organisers have sourced a large number of historic warbirds from home and aboard to take part in the event. These faithfully recreated World War One replicas will perform simulated dog fights and other attack manoeuvers. The event will offer a unique opportunity to see these hardy old warriors of the sky go through their combat routines. AIRSHOW 2015 will also feature a vast array of the latest military heavy metal from Australia and overseas including super sonic jet fighters and attack helicopters. It will also boast a large number of vintage, classic and experimental aircraft and high flying barnstormers and precision stunt performers.

Among the many attractions will be Night Alight, an after dark aviation spectacular with its totally breathtaking, fiery and explosive finale. The Avalon-based event will also present a host of ground attractions and historic re-enactments. The Australian International Airshow represents great value for money and is a great day out for the entire family.

From me:
I usually have my trusty Canon 7D with the excellent Canon 100 - 400 L IS lens but going out on a limb here with a Sigma 150 - 600mm Sport lens. Unfortunately the dictates of the cost of event insurance means that the aircraft are getting further away from the spectator line and higher off the ground. This requires a longer focal length lens which is also heavier and more prone to loss of sharpness or more cropping which also results in less sharpness. Will I use a monopod with this 2.8kg beast, time will tell. Will I need to keep up a gym membership, ;) time will tell. I also use a 70-200mm lens on a Canon 5Dii for formation or large aircraft in air plus the 24-105mm for static images. Heavy camera bag but it keeps me fit!!

5 days of photography to come with events on Friday afternoon and Saturday plus some road photography from the 2,450 km round trip of the journey. I have filled the fuel tank and the windscreen washer & the wallet & everything else looks good.

Update: Wallet was empty on return. Airshow price for food and drinks worse than state taxation. $12 burgers, $6 fries, $5 coffees, $5 drinks but better than cooking myself. I did take in water and fruit to keep me going but a man has to eat.

And yes, the 150-600mm Sigma lens was a good investment but the 2.8kg lens when handheld was a good test of arm strength. Shake, shake, shake !!! Maybe I should offer myself as a development tool for IS/VR/OIS/??? for the lens manufacturers.

2019 update: I used the 7D2 with 100-400mm L IS II lens and the 5Ds with the 70-200mm f2.8 L IS II or 24 - 105mm f4. Happy with results. Very few rejects.