1) Philately 2) Stamp collecting 3) Stamp collection 
Aerophilately is the branch of philately that specializes in the study of airmail. Philatelists have observed the development of mail transport by air from its beginning, and all aspects of airmail service have been extensively studied and documented by specialists. == Scope == The scope of aerophilately includes: While most of the study of airmai...
collecting of air-mail stamps
collecting of air-mail stamps
[n] - the collection and study of airmail stamps
aerophilately The collecting of airmail stamps.
noun the collection and study of airmail stamps
the study or collection of airmail stamps, cancellations, etc.