News of a weak first-quarter performance by Bombardier’s Commercial Aircraft unit was offset somewhat by the cash-generating sale of its Downsview aircraft assembly operation, a new CRJ order and optimism that the C Series program tie-up with Airbus will close within weeks. Bombardier’s commercial operation saw quarterly revenue fall 12% year-over-year to $463 million, the company said May 3. Performance by the rest of the company helped lift overall revenue 12%, to $4 billion, ...