Although the series takes place in Seattle, the Vancouver film location is given away when Linden and Holder drive by a red Canadian mailbox about mid-way through the episode.
When Sarah and her son Jack are at the airport, they walk passed the International sign which has an American flag beside it because it's filmed in Vancouver B.C's airport.
When Sarah and Jack first arrive at the airport and are seen getting out of Regi's car, a "YVR" sign is visible reflected in the window. "YVR" is the International Air Transport Association (IATA) airport code for Vancouver International Airport. The scene is set at the Seattle-Tacoma (Sea-Tac) International Airport, who's IATA airport code is SEA, but the series is produced in Vancouver, Canada.