The "interline fare calculator" from my id90.com will give you all the details (however they can be a little off sometimes). It is the best option.
As a rule of thumbs there is no fuel surcharge (YQ or YR) on a zed ticket which is a huge savings.
When you have a connection which is less than 24h hours and show your boarding pass you can have some taxes exemption but ONLY if you connect your airline and show the boarding pass.
A zed ticket cannot be issued with some taxes overridden.
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