eMailman .. I will say that purely domestic US flights are a far different story . Although oddly, bags coming off an originating It'l seem to get some definite priority IMHO.
i.e SYD-LAX will be fine
SYD-LAX-IAH will also be fine, but a LAX-IAH is a lottery!
Maybe the It'l tags shame the bag guys to be a bit more considerate?
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~ Glen ~