two
o'clock
There was very little wind and , although it was growing colder , they knew they could easily bundle up in their aviation coats and boots . Sam and Tom had been trying out the biplane , and they pronounced everything in perfect order for a flight . `` Dick , let me run the machine over , '' said Sam , and the big brother agreed , for Tom had been at the wheel on a previous occasion . The boys had no classes to attend after lunch and so got away by two o'clock . `` I trust we can see the girls , '' said Dick , as they started up the engine of the flying machine . `` Oh , they 'll be at liberty after hours , '' answered Tom . `` They always are . ''