No, there's no law that specifically says you must.
On June 5th, 2014. See this statement in context.
On June 5th, 2014. See this statement in context.
June 5th, 2014 / 10:05 a.m.
National Chair, Canadian Federal Pilots Association
No, there's no law that specifically says you must.
See context to find out what was said next.