New Zealand express flights

[Jeff N]

I witnessed an unusual (to me) sighting over Sydney last Friday night.

At dusk, I noticed a flight high over Sydney heading for New Zealand.

It looked a sight with sunlight glistening off it and a large vapour trail behind.

Not overly unusual in itself, however it hadn't yet disappeared into the east when two more showed up doing exactly the same thing on identical paths. They were even almost side by side, complete with sunlight and vapour trails.

After a bit of research, it turns out the first aircraft was a Singapore 777, and the other two were an Air Asia flight and a Malysian 777.

Is this a common occurrence?