If you believe the original air dates on Discovery Channel Canada are incorrect, please provide proof.

IMDB shows the episode list as above: https://www.imdb.com/title/tt0386950/episodes?season=15

IMDb is not a reliable source. It looks like Deadly Transmission aired on January 15, which means the air dates are likely bogus.

https://www.bellmedia.ca/the-lede/press/chill-discovery-brands-usher-2016-winter-schedules-filled-fresh-hits-returning-favourites-january/
https://www.facebook.com/watch/?v=1239436259403329
https://www.facebook.com/Mayday.AirCrash/posts/1019088731484707
http://web.archive.org/web/20160113035712/http://www.discovery.ca/Schedule

Well IMDB is the top searched for episode list and everything else seems to favor IMDBs list. Air dates for documentaries don't ever seem to deem their order either as they usually air out of order anyways.

These episodes are broadcast in different orders in different countries on different dates for some reason, so it's a real mess deciding which order to put episodes in. Both Wikipedia and IMDB reports them in the order the poster suggested, so I would suggest using that order in general. Fun fact: TheTVDB has yet another "aired" order (different from the current one on both TMDB and IMDB): https://thetvdb.com/series/mayday/seasons/official/15. However, the DVD order on TheTVdb is identical to IMDB and Wikipedia.

@antrillion said:

These episodes are broadcast in different orders in different countries on different dates for some reason, so it's a real mess deciding which order to put episodes in. Both Wikipedia and IMDB reports them in the order the poster suggested, so I would suggest using that order in general.

This series is coming from Discovery Channel Canada. So, the airdates and the order of the episodes should be from Discovery Channel Canada.