Airlines themselves vary on this. Some are great, somne are pathetic. HOWEVER lots of TAs allow you to peruse complete and detailed fare rules.

As you live in OZ, I presume most of your enquiry relates to fares FROM oz? In which case simply go to www.travel.com.au and type in your origin and destination city, and EVERY fare on EVERY carrier has a box where farss rules can be perused. VERY useful feature.

Ditto for non OZ origin fares on sites like www.travelocity.com etc

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~ Glen ~