seven o'clock
In a few moments the excited aviators and the well-satisfied Colonel Howell emerged from the aerodrome just as young Count Zept ran up . `` Are you fellows going to stay here all night ? '' he exclaimed , almost out of breath . `` I thought you told me you 'd meet me at seven o'clock at the car . Father 's been there for a half hour . We 're waiting to take you home . '' It was necessary at once to introduce Colonel Howell to young Zept .