Changing your major is not uncommon.  Whether or not you will be able to keep the same expected graduation date is very dependent on:

1. What program you came from 
2. What program you are changing to 
3. Timing of your decision to change your program of study

While we will do our best to help you complete your degree “on time”, due to the technical nature of some subject matter and the interdependency of coursework (particularly in engineering), this is often not possible.  The College of Aeronautics and Engineering simply cannot guarantee that students will keep the same anticipated graduation date if they change their major.  For this reason, we strongly advise you to meet with one of our advisors prior to changing your major.