The name of the mystery carrier would be all over OZ bargain within about 5 minutes. And then over other sites like AFF.
You'd have a rude shock if you found yourself on Etihad with tiny meals and no water, drinks or snack outside mealtimes unless you pay for them under the very expensive buy-on-board menu.
With airlines such as SQ and QR already offering fares in the $1000 range to Europe, not sure how much cheaper these 'secret deals' would be to have to entice people away from top tier carriers.
Now if they were to market mystery flight times, but known carrier, that might be interesting. For example $1000 guaranteed on Singapore, or Qatar or Emirates, but your flight times aren't advised until the day before travel... that could be appealing. (You book for 15 August, but don't find out until 14 August whether you're departing Australia at 0600, 1300 or 2350, ect.)
but only those who buy tickets would know who they are flying with & if 2 airlines involved, then it could be either.
From SYD to LHR there are a whole bank of flights leave in late afternoon/evening. To name a few ... QF, QR, SQ, EK, EY etc.
Fares around the edges of peak season, often don't sell as well as peak season or low season, as the price is often close to peak season pricing, rather than low season pricing.
School holidays start mid to late November. So say someone wanted to fly to London 30 November & come back 2 weeks later. Not peak season, but prices are increasing right now to $1400, $1500 or more, on one stop options. (the chinese airlines might offer something cheaper, but with poor connections) & the airline came out with a $999 fare, with the only extra being for payment by any credit card of say $20 & limit baggage to 1 x 23kgs, which can be increased for additional say $50.
Personally I hate it when I see a sale price advertised for departures eg. 30 Sept to 31 March, when you know there are none at all in December or 1st half of January, but some people waste hours searching online for seats at a certain price, that don't exist. Airline yield managers/marketing must work off the theory, that if they advertise a certain price (with stuff all seats) but they put some seats out there at eg. $200, $300 more, then a certain small % of people, will go,
"oh that's not what I was looking for but still a good price"
& buy at that higher price.
I think people get really annoyed fast with these deceptive adverts.
So you might be told in advance, your flight departs between 1800 & 2200 on a certain day & arrives LHR within 25 hours & if you are getting a connecting flight from anywhere, we can advise the latest arrival time into SYD, so in other words, your flight out of SYD will be on one of these airlines ...........
They could also offer a price for 1, 2, 3, 4, 5 passengers & so on, where the more seats you buy the cheaper they get/each. They could do away with child fares altogether & just have a stipulation, that 1 of group must be 18 years or whatever.
For those with really tight budgets, the airline could say, you can ever spread out payments over few months with a credit card only, (authority to charge card automatically for a $20 handling fee per payment, so instead of paying $999 + $20 fee = $1019, simply pay $260 a month for 4 months, which would help those who don't have the readies now.
The more I think about the idea, the better it sounds.