Boeing, US airline shares close down
Southwest says 2024 capacity could take a hit
Alaska says 2024 capacity plans in flux

Reuters U.S. air carriers warned on Tuesday that their plans to increase capacity were in doubt due to more jet delivery delays from Boeing, as the hit to the airline industry from the planemaker39;s safety crisis worsens.

The airline industry has cut expectations for deliveries this year due to Boeing39;s problems, complicating efforts to meet record travel demand.

Boeing has been under heavy regulatory scrutiny following a harrowing Jan. 5 Alaska Airlines midair panel blowout that led to probes into the company39;s safety and quality standards in its production process.

Boeing deliveries are going to be way behind this year, United Airlines CEO Scott Kirby said at a conference adding that it was impossible to say when MAX 10 is going to get certified.

United39;s shares closed 1.7 lower, while Southwest Airlines shares plunged nearly 15 after it cut its Boeing delivery forecast for the year. Boeing shares closed 4.3 lower, having fallen 29 since the start of the year.

The National Transportation Safety Board said on Tuesday that it would hold a public investigative hearing into the Alaska Airlines incident on Aug. 67.

NTSB Chair Jennifer Homendy told Reuters last week the hearing would include testimony from employees at Boeing and fuselage manufacturer Spirit AeroSystems and others like Alaska Airlines.

The carrier confirmed a New York…