For the Boeing 737 I use filename cfm567bs.zip off FlightSim.com
For the A319 and A321, I use a kinda bad sound set and I don't recommend it. But I like my 747, 757, and 777 sounds. My A330 and A340 sounds are payware.
Remember on your hardest days, that the airplanes always take off against the wind... afterwards, the skies are all yours.