<p> 2 Air Canada pilots killed in collision with ground vehicle at New York's LaGuardia airport.&nbsp;</p><p> Incident at LaGuardia heightens concerns about air travel safety in the US.&nbsp;</p><p> US President Donald Trump says talks with Iran are productive, extends 48-hour deadline to open Strait of Hormuz to 5 days.&nbsp;</p><p> Tax lawyers who help American-Canadians renounce their citizenship say they're seeing increased interest.&nbsp;</p><p> Supreme Court of Canada begins hearing into Quebec's use of notwithstanding clause to protect its Bill 21 secularism law.&nbsp;</p><p> 3 months after Australia banned anyone under age 16 from accessing social media -- is it working?&nbsp;</p>