SAO JOSE DOS CAMPOS, Brazil, June 19 (Reuters) - B erkshire Hathaway's NetJets has started to convert its options for the purchase of up to 250 Praetor 500 business jets from Embraer into firm orders, an executive at the Brazilian planemaker said on Wednesday.

The first five options have been converted into orders this year, with deliveries expected to start in 2025, the market and product intelligence director of Embraer's executive jets unit, Alvadi Serpa Junior, told reporters at the company's headquarters.

"As we move forward, we should expect to see more of these orders," Serpa Junior said. (Reporting by Gabriel Araujo, editing by Deepa Babington)