Hal Dane felt a catch of pure excitement in his breath. This was going to be different from any flying he had ever known. Heretofore it had been "keep up speed, avoid stalls, and thus avoid the fatal spin." Now Raynor was deliberately taking him into the danger of stall and spin! Raynor was deliberately taking him into the dangers he might incur if fog, sleet or rain caught him, if unknown mountains loomed suddenly ahead, if storm winds hurled him out of balance.