June 24 (Reuters) - Boeing ( BA ) has offered to acquire

Spirit AeroSystems Holdings ( SPR ) in a deal funded mostly by

stock that values its key supplier at about $35 per share,

Bloomberg News reported on Monday, citing people familiar with

the matter.

This offer represents a premium of nearly 6% over Spirit's

stock closing price of $33.07 on Monday and a 22.4% upside to

its closing price on Feb. 29, the day before Boeing's ( BA ) takeover

talks became public.

Boeing ( BA ) switched its offer from an all-cash one and while the

final terms of the latest offer are still being discussed, it

could include a small amount of cash, Bloomberg reported, adding

the deal is expected to be announced within a matter of days.

Spirit said it remains "focused on providing the best

quality products for our customers". Boeing ( BA ) did not immediately

respond to a Reuters request for comment.

Boeing ( BA ) initiated talks earlier this year to buy back the

Wichita, Kansas-based supplier it spun off in 2005, seeking to

stabilize a key part of the supply chain for its

strongest-selling jet following a mid-air blow out on a new 737

MAX in January.

Boeing ( BA ) has said it is buying back Spirit to secure safety

and quality in its plants, after blaming Spirit for sending

incomplete or faulty parts to its factories.

However, talks hit a stumbling block over Spirit's work for

Airbus, with the European group threatening to block

any deal that involved Boeing ( BA ) building parts for its newest

models.

The deal will require Spirit to spin off some of its

manufacturing plants to Airbus, Bloomberg reported.

Reuters earlier reported that Boeing ( BA ) and Airbus have broadly

succeeded in dividing Spirit's programs into work that Boeing ( BA )

will take back, along with work that the Airbus will take.

Spirit posted a net loss of $617 million and burned through

$444 million in the first quarter, far more than analysts had

expected.

(Reporting by Nilutpal Timsina in Bengaluru; Editing by Janane

Venkatraman and Rashmi Aich

)