HI. AGL is highly exposed to the mid-south US markets and they had a lot of difficult weather this past weekend causing system wide delays for AGL. The aircraft they use for YYG flows through the US markets and back to domestic every day.
AGL also uses older CRJ100 on these markets BUT they are being phased out and are now taking delivery of newer more reliable CRJ200. The old CRJ100 fleet should be out soon.
Not that any of that makes any difference when you are a passenger but they have been in business with Air Canada for almost 20 years so I have confidence they will sort out the fleet issues and the weather is the weather.