MID-SIZED and regional airlines in the United States are suffering from a pilot shortage that could threaten the health of the broader U.S. aviation industry.

    Some regional carriers have trimmed about 5 percent of their flights, cuts that have hit smaller airports, such as in Redding, California, or Erie, Pennsylvania.

    The staffing crunch could also constrain traffic for larger companies like United Airlines and Delta Air Lines that depend on the mid-sized companies to serve rural consumers and feed customers into their networks.

    “It’s becoming a crisis at some carriers, resulting in the cancellation of flights and other serious disruptions,” said Patrick Smith, a pilot who runs “Ask the Pilot,” an aviation blog.

    Republic Airways, which operates flights for Delta, United and American Airlines, filed for bankruptcy protection last month, citing the labor crunch.

    “We’ve attempted to restructure the obligations on our out-of-favor aircraft — made so by a nationwide pilot shortage — and to increase our revenues,” said Bryan Bedford, chief executive officer of Republic Airways.

    “It’s become clear that this process has reached an impasse and that any further delay would unnecessarily waste valuable resources of the enterprise.”

    Things at Republic came to a head last July, when the airline acknowledged cutting 4 percent of its flights due to a dearth of pilots. Delta subsequently filed suit against Republic, alleging breach of contract.

    Aviation industry insiders cite a number of factors for the drop-off in pilots: longer working hours, contentious relations with management, fewer job protections and industry turnover with the expected retirement of some 18,000 pilots through 2022.

    But the biggest factor is compensation. (SD-Agencies)