Aug 5 (Reuters) - Spirit AeroSystems ( SPR ) said on

Monday its quarterly losses more than doubled as 737 fuselage

shipments to its biggest customer Boeing ( BA ) fell and losses

mounted on its Airbus A220 program.

Net loss for the second quarter widened to $415 million from

a loss of $206 million, an indication of Spirit's fragile

finances and the importance of Boeing's ( BA ) deal to buy back the

supplier it spun off in 2005.

Spirit said its results were hit by delivery delays on

Boeing's ( BA ) strong-selling 737 MAX jet, which saw slower production

following a mid-air panel blowout in January. Shares of the

supplier were down 2.2% after the bell.

Spirit delivered 27 737 fuselages in the quarter through

June 27, lower than it anticipated and sharply down from the 74

it delivered in the year-ago period.

The company has struggled to stem losses and stabilize cash

flows following troubles at Boeing ( BA ). Its ability to deliver clean

737 fuselages without quality problems will be key for Boeing ( BA ),

which expects to produce the jets at a rate of 38 a month by

year-end.

The U.S. supplier has also lost money on Airbus' A220

program on higher costs. During the second quarter, Spirit

recorded $25 million of forward losses on the program. Overall,

it recorded net forward losses of $214 million in the period.

The company said it has developed plans to pursue various

options to improve liquidity, as it burnt $597 million in cash.

Analysts on average expected a cash burn of $169 million,

according to LSEG data.

Spirit said it borrowed $200 million under a bridge term

loan facility last month.

Adjusted loss per share was $2.73, wider than expectations

of 90 cents. Quarterly revenue of $1.49 billion missed analysts'

estimate of $1.59 billion.