I still think Maya is difficult to use just trying the tutorial is tough enough but modeling an airport? 3ds max has my vote at the moment. The floor plan for the airport is complete now need to collect textures and begin modeling on Maya. The table and chair designs are finished need to model those as the glasses and the plates and already done. Still need to design the room that it all goes in. A little(big) challenge to myself if I have the time is to start making the inside of the airplane thats sitting in the tarmac outside the window.