By Doug Cameron 

A shortage of seats and other parts for jetliner interiors has slowed production of some commercial jets and now spread to the VIP sector, delaying two new jumbo jets that are being converted to fly foreign heads of state.

The jets are being converted by a unit of L-3 Communications Holdings Inc. at its facility in Waco, Texas. The aerospace-and-defense company didn't identify the planes involved, but in 2012 said it won contracts to convert two Boeing Co. 747-8s for use by heads of state. It said Thursday that problems in securing interior parts and quality issues prompted the delay and forced it to take a $17 million charge against first-quarter earnings.

L-3's problems highlight the wider challenge faced by Boeing and rival Airbus Group NV as they boost production of their commercial jets. Both companies have wrestled in recent months with a shortage of business-class seats, and delays in securing other interior fittings, such as galleys and lavatories, can snarl factories or force them to park partly finished planes.

Upsetting heads of state may be in a different league from leaving airlines short of a new jet.

"I was especially disappointed about the head-of-state contract losses," L-3 Chief Financial Officer Ralph D'Ambrosio said on a post-earnings' call.

The 747-8 carries a list price of $368 million. Conversion to VIP use can more than double or triple the cost and take two years to complete. The plane has been selected by the U.S. government to replace the existing fleet used by the president as Air Force One, and heads-of-state planes usually include sophisticated communications and defensive equipment, as well as plush interiors.

Mr. D'Ambrosio said one of the jumbos had been delayed by six weeks and was due to be delivered in late June, while the second plane was three months behind schedule and expected to be taken by its customer in December. The company declined to identify the clients.

Boeing has secured nine orders for the VIP version of its upgraded jumbo. The first jet started flying for its unidentified customer earlier this year, while another seven are at conversion centers.

L-3 employs around 2,000 staff at the Waco facility, which converts military and VIP aircraft and was once owned by Chrysler Corp.

The commercial industry's problem with interiors can also be traced in part to the Lone Star State.

France's Zodiac Aerospace SA, a big seat supplier, amassed a backlog of 6,000 unfilled seat orders, citing a monthlong strike last year at its facility in Gainesville, Texas. The company has reduced its backlog of seats to around 2,000, boosting production to 700 a day.

Boeing said last week that a shortage of business-class seats made by Zodiac had slowed completion of some 787 Dreamliners for such customers as American Airlines Group Inc. and Etihad Airways.

Airbus jetliner chief Fabrice Brégier said this month that it was "unacceptable" some suppliers of cabin interior equipment have suffered repeated production shortfalls. He called on them to boost their "industrial maturity" to match that of the plane makers.

Robert Wall contributed to this article.

Write to Doug Cameron at doug.cameron@wsj.com

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