OTTAWA—Foreign Affairs Minister Marc Garneau says 500 more Canadians were flown out of Kabul on an American flight Thursday. Canada’s military mission in Afghanistan ended that day, leaving an unknown number of Canadians and their families trapped, as well as vulnerable Afghans who fear Taliban reprisals. The Canadian withdrawal was followed by an attack on Kabul airport that killed 13 American troops and dozens of Afghans trying to flee, deaths that President Joe Biden is vowing to avenge. Garneau says today that the Americans managed to airlift “about 500 of our people if I can put it that way” and says Canada had been doing the same as part of a “group effort” before its C-17 transport planes were withdrawn earlier Thursday. Canada’s military mission was ended as part of a staged withdrawal plan by the United States to leave by an Aug. 31 deadline. The U.S. was leading the …