I can accept the plane travelling through time. I can accept the visions, the callings, how Cal travels again and returns older. All of that is fine and is what makes the series.
What I can't accept is that back on the ground in the real world the cops are a bunch of incompetent dunderheads.
Earlier in this season, they were chasing Michaela as she sought to get Henry to a safe place. First, the cops knew about Henry before Michaela did, before she had time to go back to the provisional HQ to let Vance know. Yet the cops didn't act on their info until Michaela grabbed Henry and got into her car. The cops sat on the info for a long time, apparently until several doughnut breaks were over. Then suddenly they go after a highly sought-after individual.
Plus, when the cops were chasing Michaela, they were right on her tail. She got away, but the cops never bothered to follow up with her license plate. Too much paperwork to find out who was helping a high-value target get away, it seems.
In this episode, after the bombs go off, Adrian and Angelina are still unaccounted for. Angelina is a murderer and a kidnapper, but instead of going back into the building to look for her and Adrian, everybody just leaves so Adrian can come out, get in his car, drive away, and find Angelina, who they also just let walk away.
This series is full of stuff like this. A lot of effort into the fantastical elements while the real life elements leave you wondering if the plane, in order to grant extra perception to the passengers, had to keep the divine ledgers balanced by removing basic common sense from the rest of the world.