Loonie at lowest in more than 20 years, TSX sinks nearly 600 points / WestJet gears up for summer growth as airline banks on domestic travel amid weak loonie / WestJet gears up for summer growth, banks on domestic travel amid weak loonie / Loonie falls further after U.S. Fed rate cut. Here's what's happening / Loonie dips below 70 cents U.S. for first time since start of pandemic as Freeland resignation shakes markets / Loonie drops below 70 cents US, S&P/TSX composite down as U.S. markets also fall / Loonie drops below 70 cents US in late-morning trading, S&P/TSX composite also down / S&P/TSX composite posts small gain Monday, loonie also higher