I've used this once or twice SYD-MEL at nights on pretty empty flights, but never tried with checked baggage. Shouldn't be an issue on a Business Class fare as its rarely full anyway, although I dont have much experience with ADL routes except the odd work trip.
Yes, checked baggage is another story. Don't think it's that easy. I think that is pushing the love. I jumped on an early (1 hr) flight today and I had a bronze pleb in toe. He even checked in without me being on the same ticket.
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