Thanks so much girls, all your replies have been really helpful!

Suz, I do have a length of cotton jersey i used as a front wrap cross when DS was newborn, maybe it's wide enough to try as a modified ring sling, will give it a go.

Otherwise i'll just be prepared for using pillows etc and the armrest.

Kristy, thanks so much for the peanut offer! My friend has one and loves it! But for the purpose of the flight i might just give the home made one a go and bring along my ergo.

I'm pretty sure our plane doesn't have baby basinettes as it's a smaller plane. A friend of mine works for qantas so i'll ask her what the policy on slings are.

Cheers
Sharon