Flights from Dallas (DFW) to Shanghai (PVG) ~$370 in April with Air Canada

Hey Guys, was just looking up some flights to China and noticed some low prices for flights to Shanghai.
I looked up Dallas and it was starting at $369 with Air Camada and around $480 with United.
I saw prices for around $550 from Detroit (DTW) too and even $396 from Cleveland (CLE).
Look around on Google flights and most places that Air Canada flies to seems to have these lower than usual prices.
Example of DFW to PVG https://www.google.com/flights?hl…1;sd:1;t:f