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80% off ? its not sure for official discount . maybe stolen airlines account or using stolen card from purchase ticket . beware
That is the real Question? 80% off the full-fare?
80% off what?
Do you have any sample fairs?
Are these Mileage tickets? Do travelers earn mileage?
There are many legitimate ways to get discounted travel.
Sellers that give vague answers tend to be hiding something, and despite all the protests from the OP that the tickets are legitimate - anybody offering 40%-80% off an airline ticket is running a scam. They either don't have anything to sell, are trying to fool people who usually vastly overpay for tickets, are using stolen cards to buy the tickets or have hijacked someones airline points account.