At United and Alaska airlines, frustration with Boeing’s manufacturing problems is boiling over

The leaders of United Airlines and Alaska Airlines took turns Tuesday blasting Boeing over manufacturing problems that have led to the grounding of more than 140 of their planes, with United’s CEO saying his airline will consider alternatives to buying a future, larger version of the Boeing 737 Max.

“I am more than frustrated and disappointed. I am angry,” Alaska Airlines CEO Ben Minicucci told “NBC Nightly News” in an interview that aired Tuesday night. “My demand on Boeing is, what are they going to do to improve their quality programs in-house?”

United CEO Scott Kirby said that Boeing needs “real action” to restore its previous reputation for quality.

Boeing said workers at its 737 factory would stop work on Thursday to hold a special session to focus on quality.

United, which has been unable to use its 79 Max 9s, disclosed on Monday that it expects to lose money in the first three months of this year because of the grounding.

Kirby said on CNBC that he believes that the Max 9s could be cleared to fly again soon, “but I’m disappointed that the manufacturing challenges do keep happening at Boeing.”

At times over the past few years, manufacturing flaws have held up deliveries of Max jets and a larger Boeing plane, the 787. Last year, United received 24 fewer Boeing aircraft than it expected.

United has a standing order for Max 10 jets, a larger version of the Max line. However, that model and a smaller one, the Max 7, are years behind schedule for being certified by the Federal Aviation Administration. The grounding of the Max 9 jets is likely to further complicate Boeing’s drive to get the new models approved.

Kirby said the Max 10 is at least five years behind schedule and could be pushed further into the future.

“I think this is the straw — the Max 9 grounding — is probably the straw that broke the camel’s back for us,” he told CNBC. “We’re going to at least build a plan that doesn’t have the Max 10 in it.”