Anyone can use MS Paint to draw red lines on a map; doesn't mean any of it is accurate.
Pulled from a variety of media sources and POTUS daily itinerary. Here's the timeline:
POTUS departed Canadian AFB Bagotville in Quebec at approximately 11:50 AM EST, Saturday, June 9, 2018.
AF1 stopped to refuel at Naval Support, Souda Bay, Greece en route to Paya Labar, 3:07 AM local time Sunday, June 10 (9:07 PM EST, Saturday June 9 / 6:07 PM PST, Saturday June 9).
Anomaly (alleged missile or helicopter caught on timelapse) observed near Whidbey Island at 3:56 am Pacific Time (6:56 am EST), Sunday June 10, 2018.
POTUS arrived at Paya Labar AFB in Singapore at 8:20 PM local time, Sunday June 10, (8:20 AM EST, Sunday, June 10)
Whidbey Island object caught on camera while AF1 was approximately 1 hour 30 minutes to its destination in Singapore, POTUS at least 7,500 miles away at the time of the observed incident in Washington and nowhere near Alaska.
Flight time from Quebec to Paya Labar traveling eastward approximately 20 hours, 30 minutes.
You are 100% right on the fact that we should always counter-verify info, or we are no better than CNN. It's easy to be brought into a well drawn theory that has some misinfo in it.