A simple resource for dream interpretation is a dream dictionary, I generally use this site:
http://www.dreammoods.com/They're not great for complex dreams, but symbols that stand out can be interpreted, like you say you were at an airport, it doesn't matter if it looked like an airport, but you KNOW it was an airport. So check airport:
QuoteTo see an airport in your dream symbolizes birth (arrivals) and death (departures). If the airport is busy, then it signifies the desire for freedom, high ideals, ambition, and hopes. It is an indication that you are approaching a new departure in your life. Some new idea is taking off or is ready to take off. You may be experiencing a new relationship, new career path or new adventure.
To dream of a deserted airport indicates that your plans or goals will be changed or delayed. You are having to put some aspect of your life on hold.
Repeat that for every major symbol you remember and try to piece it together, you'll find a pretty surprisingly coherent story that says something about your life more often than not.
I had a more ham fisted version where I looked in the mirror and saw a pretty girl there, lol.
(Added later)
The fact you were stopped at security is probably something like gate keeping assuming it's related to transition, which since you think it is, it is. I didn't look that one up but it sounds about right anyway.