With almost 100 different airlines and their staff operating within the walls of Heathrow Airport, the employees of the airport are tasked with improving the overall operations for the safety and efficiency of all. If the role you are being considered for will be handling or managing large-scale projects, your interviewer will want to get a sense of how you handle projects. Since this question will allow them to gauge your ability to complete all aspects of a project, make sure to fully discuss the entire project life of the example you give. If you are a recent graduate, you can certainly discuss a project you completed during your studies as long as you can prove that it was demanding and it took all of your effort to complete.