Please don't take what i am about to say as derogatory, or an insult to LBA, but could it be due to the terminal facilities? The reason I mention this, is a comparison with BHX. When I first started visiting BHX, the original 1930's terminal (along with several tagged on extensions) was in service. Then in the mid 1980's, a new terminal was opened on the eastern side of the airport. Immediately, Air France, Lufthansa and Swissair launched daily services. I remember a quote from Swissair along the lines of 'we have long wanted to serve Birmingham, but we didn't want our passengers to experience the outdated facilities of the old terminal'. Could something similar be the case at LBA?
I'm not very familiar with LBA, but have been looking it up online. One thing from photos, that puzzles me is that several stands at the terminal seem to be used for vehicle parking or have buildings constructed on them whilst aircraft are parked hundreds of metres away (surely the wrong way round).
I'm also aware (from posts here), that plans for a new terminal were turned down and so, further redevelopment of the current terminal is the only option. I totally agree that LBA, it's passengers and airlines would benefit and deserve a new modern, purpose designed terminal giving greater efficiency as well as being more environmentally sustainable.
Just my thoughts.