Hello BAHA ACUNER, I worked for Raytheon Aircraft Services (RAS) for 3.5 years. I was a supervisor and then Assistant Department Head for Line Service. RAS has a network of FBOs nationwide and I had the privilege of learning all about the business. I have refueled everything from a Cessna 172 all the way up to a Boeing 747. Towed aircraft of all sizes, all in all, it was a lot of fun. I would be more than happy to answer any of your questions. I worked for RAS while attending Embry-Riddle Aeronautical University. Once I graduated, I left RAS. Take Care, JC Gideon