Dreams involving planes often symbolize aspirations, journeys, and transitions in life. In your dream, the act of driving could represent your current path or how you navigate through your daily life in Las Vegas. The presence of two planes landing might indicate a sense of competition or parallel paths in your life, perhaps highlighting feelings about your own ambitions or the direction you are taking.

The first plane's unusual behavior—bouncing back up and performing a backflip—could suggest unexpected challenges or a desire to regain control over a situation. The collision and explosion might symbolize feelings of loss or anxiety about something in your life that feels out of control or unsafe. The fact that you felt a strong connection to the event, despite not knowing anyone involved, indicates that this incident might resonate with deeper fears or experiences, possibly relating to change or the unpredictability of life.

Returning home to mourn with your sister suggests a need for support and comfort during troubling times. This part of the dream may reflect your emotional state and highlight the importance of family or close relationships in helping you process difficult feelings.

Overall, this dream could be prompting you to reflect on your current life circumstances, your aspirations, and how you deal with unexpected events or emotions. Consider if there are areas in your life where you feel like things are off balance or where you might need to reach out for support. It could be beneficial to talk to someone about any changes or feelings you are experiencing.