Lockheed Martin Corp. agreed to buy United Technologies Corp.’s Sikorsky unit, adding the largest maker of military helicopters to a lineup that includes warplanes and missiles, according to a person familiar with the talks.

The transaction is scheduled to be announced Monday, said the person, who asked not to be identified because the matter isn’t public yet. Sikorsky had sales of about $7.45 billion last year, and Reuters reported earlier today the price will exceed $8 billion.

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