Steve,
Rule of thumb is one-page only. It's important to recognize why. In any other industry, by the time you achieve this level of experience two-pages is common and usually expected. However, the airline industry is different.
When you submit a resume it is usually to either a recruiter or to an interviewer.
- The recruiter is probably overworked, underpaid and completely devoid of excess time. So, you want them to easily pick out the requisite information in less than 10 seconds.
- The interviewer is pressed for time to move through all candidates for that day. Not to mention they will also have your complete application in front of them for reference. So they will also do a 'scan' of your resume. Again, 10 seconds.
Couple of suggestions to condense your resume -
The employment section need only be five years previous.
Try to minimize your job descriptions. Keeping the pertinent information and not "fluffing."
Although you have a long and distinguished career I am confident you can abbreviate your job descriptions to suffice. Remember, you are already working in the industry - what your job functions have been is familiar to the recruiter/interviewer. So you don't have to go into extreme detail.
Hope this helps!