>Have you checked the AMADEUS files on the web site?
>http://www.amadeusschweiz.com/en/documentation/usermanuals.html

Those are user manuals. Most promising looks Amadeus Air user guide:

File which I received name was air.txt and first token in file is AIR-BLK206
Maybe BLK206 is some booking format descriptor. Google returns some
documens like my using this so it looks like it is commonly used.

This file probably describes how to reserve ticket, which produces air.txt file.

I seacrched this and ticket user guide for BLK but those do not contains this abbreviation.

Commands in user manual look different than those from this file.
How to use this information to extract reservation number and destination airport
from this file ?
I havent found format description using google. There are amadeus user guides, tutorials
ja quick reference files similar which you posted but I do'nt understand how to
use them to parse this file.
One message describes that this is form of EDIFACT. However EDIFACT message
sample in Wikipedia is also diffrerent.
I need to create quick prototype to customer which shows that we vćan read those files.

Maybe there are some programs which can used to display it in human readable form ?