Installation:

1: Install these mods:
https://www.gtainside.com/en/gta4/airplanes/84004-airbus-a319/
https://www.gtainside.com/en/gta4/airplanes/42463-boeing-757-200/

2: Replace the "a319.wtd" and "b752.wtd" files with the ones provided

3: To the feckin' sky!!! :)