Mardini founded Jetex in Dubai in 2005. The company operates 38 private jet terminals globally that offer services like international trip planning, aircraft fueling, ground handling, and bespoke concierge services. Jetex employs about 850 people. In October 2023, Jetex announced that it is expanding its footprint to Latin America with a new supervisory station in Peru. Mardini has 35 years of experience. He is also a board member of the Middle East and North Africa Business Aviation Association and an active member of the World Economic Forum and the Young Presidents' Organization.