This Savage Sky — Stella Whitelaw

Although she had thoroughly enjoyed the glamour and excitement of being an air stewardess, Kirstie had eventually felt like doing an even more worthwhile job, and had become a qualified nursing sister. Now she was combining both jobs - by working for the Air Ambulance Medical Service, flying all over the world to bring home ill or injured patients for treatment.
But the travelling threw her into constant contact with her boss, Dr Carson Black - who rapidly became more than just a collegue to her. But there were several good reasons why she must never let herself get involved with him....

Hero: Dr./Doctor Carson Black
Heroine: Kirstie Duvall