Hi everybody,

for all who haven't found out yet how to add a missing Airport with RWY's to the 757's Database here's the way:

First of all go to the FS\Captain_Sim\navigation Folder and find the Airports.db and Runways.db files.

1. Now open the Airports.db File with Notepad. You see a list of airports (the ICAO Codes in alphabetical order) with the following format:
Elevation;ICAO Code; Latitude; Longitude
Place your curser in the list according to the missing AP's ICAO Code (f.e. missing Airport LEPA is to be placed between LEOC and LEPP).
Now open up your Internet Browser and go to http://worldaerodata.com and insert the ICAO Code in the search field for your missing Airport. You can now copy all the according data over to your Airports.db file.
F.e. LEPA:
27;LEPA;39.551675;2.738808
When done save and close the file but keep the webside open.

2. Open the Runways.db with notepad. You now see the list of RWs of the following format:
ICAO-Code; Glideslope Angle; ILS Frequency; Latitude; Length; Longitude; Name (f.e. 31L); Heading.
In your Internet Browser go down the page to runways and click at the according link to get the Coordinates, Length, and Heading of your runways.
F.e. RWY 06L:
LEPA;3;110.9;39.547147;10728;2.710728;06L;59
Since the page doesn't show the GS-Angle and ILS Frequency I had to take them from Flightsim Commander (maybe somebody knows a better link for Airport data, incl. ILS  :-/).

If everything went right your 757's CDU should now have LEPA (with at least RWY 06L) in its database.

Good luck and best regards,
Mike.

BTW the whole RWY part for LEPA:

LEPA;3;110.9;39.547147;10728;2.710728;06L;59
LEPA;3;109.9;39.562503;10728;2.743194;24R;239
LEPA;0;0;39.541256;10039;2.731739;06R;59
LEPA;3;109.3;39.555339;9842;2.761528;24L;239.