[Streamliner]

It's not transoceanic, and only seasonal for now, but still nice:

San Diego gets its first nonstop flight to Montreal
San Diego gets its first nonstop flight to Montreal
Union-Tribune
October 15, 2019

Starting next summer, San Diego International Airport will get its first nonstop flight to Montreal, Canadian airline Air Transat announced Tuesday.

Starting off as a seasonal service, the flights will be available three days a week — Mondays, Wednesdays and Sundays — between June 15 and Oct. 28.

....

“The volume of traffic between Quebec and the United States has been growing strongly, at a rate of 6 percent on an annual weighted average since 2013,” said airline spokeswoman Debbie Cabana. “The volume in California is growing just as strongly, with an average of 7 percent per year. We believe that traffic between Quebec and San Diego will be stimulated with the addition of a direct service.”

In San Diego, Montreal is considered the top unserved Canadian market, with nearly 70 passenger per day traveling there, including those passengers who currently drive to Los Angeles International Airport to take a nonstop flight, said airport spokeswoman Rebecca Gilbert. Historically, some 32 percent of those traveling between the two cities have been passengers originating in San Diego, and 67 percent were departing out of Montreal.

Cabana said it is too soon to say whether the San Diego-Montreal service could eventually become more frequent or convert to year-round service.