Jetstar can have staff at the
gate with a set of scales and a credit card machine.
For JQ, QF & VA look at web sites and ticket t&c's. Read carefuly in full.
In AU the time required to board a full B737 can be half of what is common in USA:- far less carry on.
Some routes can have smaller aircraft, with more resrictive rules
From QF forum locked thread -->.
Carry-On Weight Restrictions: Qantas vs. Virgin vs. Jetstar (Domestic)
No wonder jetstar's ticket prices are so cheap.
virgin australia or qantas, which one is more lenient of carry on?
Neither. Follow the ticket t&c's.
Acceptable carry on in AU is far les than in USA.