Kim breaking down on the bus is a hint to me that she didn’t leave ABQ. She won’t actually get on the plane back to Florida. She’ll reunite with Jimmy one last time.
Part of me hopes that Kim and Jimmy use the vacuum repair man one last time to escape… and the final scene of the Breaking Bad universe is those two, happy, with new identities, somewhere in Alaska, where they run into Jesse Pinkman, and then they all continue on their separate ways. But part of me knows this can’t have a happy ending.
If you go back to the start of the scene with Kim at the airport after arriving in ABQ, it seemed to linger on the Alaska sign. Maybe that was just foreshadowing the later scene between her and Jesse, but maybe there’s more.