I first trained in airbrush makeup over 15 years ago. It’s a method of applying the foundation base, blush, contour and highlighter through an air gun which expels a very fine mist of product onto the face creating the most amazing finish to the skin. It produces a finish on the skin which is so flawless and natural without even looking like you are wearing makeup! Once dried, it becomes almost waterproof which makes it such a great option for bridal makeup, no streaky makeup with tears or the dreaded makeup marks on white shirts and the durability is second to none. It gives a real luxury feel to the makeup and the service. 
My brides have always loved their airbrush makeup, with many comments of how 'light weight' it feels. The ingredients within the airbrush foundation do not clog pores, allowing your skin to breathe. 
The airbrush system is a big investment for any professional makeup artist's kit and tends to be used a lot in the TV and film industry as it's HD ready so looks incredible on camera. 
 I do also have many options of conventional foundation in my pro kit, so the choice is there for you.