The nation's air transport system is an interesting case of public policy failure, writes David Ignatius in the Denver Post. He notes that former American Airlines CEO Bob Crandall supports a modern version of re-regulation. Meanwhile, soaring fuel prices continue to threaten the stability of carriers. "The industry's woes are documented in statistics gathered by the Air Transport Association. Since deregulation, nearly 200 airlines have come and gone -- most of them the low-cost, non-union carriers that were going to be the industry's salvation," Ignatius writes.