Unfortunately the term "asthma" gets banded around quite a lot in medicine.
Patients may be labelled whether they have a mild wheeze when they get a cold, or whether they have to take shed loads of medication on a daily basis.
Sorry, can't answer specifics re: airlines / raf etc, but it would appear that asthmatic pilots do exist. (It may be worth performing a search for your specific enquiry).
Being pilot's you are fixating on numbers, the answers you are looking for can be found amongst this lot
http://www.brit-thoracic.org.uk/Guid...97_asthma_html
I suspect that your examining doc would be more interested in the frequency and duration of your symptoms, how they affect your day to day life, whether or not you've needed hospital admission etc, rather than relying on figures alone.
On a positive note, symptoms can usually be well controlled, with patience and accurate treatment.
PS Joey, it may be worth having a word with your doc, to ensure he has made the correct diagnosis.