Air Canada says its capacity as measured in available seat miles was down 82.1 per cent compared with a year ago, while traffic measured in revenue passenger miles was down 89.5 per cent.The airline plans to approximately double its second quarter capacity from the same quarter in 2020, but says compared with the same period in 2019 that second quarter capacity is expected to be down 84 per cent.Last month, Air Canada reached a deal for $5.9 billion in federal aid including money earmarked to help refund customers..