> If airline ticket resale was as easy as concert tickets, you'd probably see a predatory scalping market develop.

I don't think so, because a predatory scalping market only happens when artists are pricing their tickets below the market rate.

Airlines have so such compunction, so they'd just raise their prices until scalpers no longer had a margin opportunity. Or, to put in another way, airline pricing is already as "predatory" as the most aggressive scalping markets.