It is symbolic of the completion of a long journey. You have been working at something very hard and you see the goal in sight. This could mean that you have just finished this project that you have been working on or it could mean that you are getting close to the destination and are almost there. These are any of the reasons that you might see your flight landing in the airport.
When you see an airplane landing it can also mean that you have been trying very hard to understand a new point of view. Someone has been talking with you recently and been trying to discuss new viewpoints with you. This is likely an issue that you were highly opinionated on beforehand. Your companion has succeeded in changing your opinion, or at the very least succeeded in making you see their point of view for what it really is. You should count this as a great accomplishment on your part because it is not easy to keep an open mind all of the time. Even if it took you some time to come around to their way of thinking, you have finally done it and this dream is your indication of that.
This airplane landing that you are dreaming about could also represent that you have just completed an entire phase of your life. While a human life cannot be divided accurately into phases and while every day does not seem to feel different than the one before it, it is undeniable that we grow and change just a bit with each and every day, even if it is not immediately perceptible. When you see the plane landing in your dream it lets you know that there was a phase of your life that has been completed. After this dream, start to look at life a little bit differently than you did before. This airplane landing also signifies good luck. You were able to make it to your destination on time and in shape. This means that you have completed the phase of your life successfully and are on a good track to succeed in the future as well.
If you are a passenger in the airplane that is landing, then this means that you had set realistic goals for yourself and were able to meet them. This is a good indication that whatever obstacle you have just passed or whatever landmark you have just crossed was a realistic one for you to set your sights toward. Use this experience to model your future experiences that take place in the same vein. This is also an indication that you are a good judge of your own abilities. You know what level of performance you can expect from yourself and know what challenges you will be able to meet whenever issues come up in the future.