2010 20thcentury aeronautics aerospaceengineers aerospaceindustries aircraftindustry airlines airtrafficcontrol appropriationsandexpenditures astronautics astronauticsandstate astronomy casestudies commercial commercialaeronautics costofoperation deregulation education(continuingeducation) employees equipmentandsupplies finance france germany governmentpolicy greatbritain history india internationalcooperation lawandlegislation lend-leaseoperations(1941-1945) management military procurement rates recruiting research science spacerace spacescience trainingof unitedstates