A startup cargo airline in Indonesia, a logistics company in Brazil with its own fleet and an American passenger airline with freighters focused on the Alaska market are each poised to receive two Boeing 737-800 converted cargo jets within a year. Modern Logistics, based in Sao Paulo, said last week it will lease two 737-800 aircraft overhauled for dedicated cargo operations to modernize its fleet and enable international expansion. The 10-year-old company’s business model is to provide comprehensive logistics services for customers, including controlling its own capacity and sourcing transportation to third parties. It currently operates four 737 Classics —…