Talkative type making joke about small airline (6)
I believe the answer is:
gasbag
'talkative type' is the definition.
(I've seen this before)
'joke about small airline' is the wordplay.
'joke' becomes 'gag' ('gag' can be a synonym of 'joke'**).
'about' indicates putting letters inside.
'small' becomes 's' (abbreviation - e.g. clothes size).
'airline' becomes 'ba' (British Airways).
's'+'ba'='sba'
'gag' going around 'sba' is 'GASBAG'.
'making' acts as a link.
(Other definitions for gasbag that I've seen before include "One who natters a lot" , "bore" , "An informal blatherer" , "goes on and on" , "I can't shut up" .)