Thanks MickG…
2. Melbourne – Sydney
The service between Australia’s two biggest cities earned Qantas Airways some $861m last year, with an average revenue per hour of $23,773. It is one of four domestic routes that make up the top ten, and the only one outside North America. It was the only one of the ten most lucrative services to post higher revenue in 2018/19, although there was only a modest 1.4% rise from $849m the year before.
Revenue per hour, as you know, is not a measure of profitability. So still looking for a source for that claim.