Hi: Yes, I've flown two houses. Both times, there were two people on board. The pool of FAA certificated gas balloon pilots that fly cluster balloon systems is rather small! I was flying both systems-- the NatGeo flying house, and the CasasYes flying house. You will notice the registration number is the same for both: N878UP-- which is my U.S. aircraft registration. You can do an 'N-Number lookup' for that on the FAA website, and also look up my pilot certificate information. -Jonathan R. Trappe