Getting past the airline agent ...

Are the airlines aware of this rule? I will be traveling from New Delhi to Beijing (I am a Canadian citizen). Generally, I have found that airline employees are not all that savvy about such rules, especially since I am departing from a country (India) which is not one of the 45 countries on the list. Just to be on the safe side, is there a firm document that I can show the airline agent so that I can board the flight?