While you can't get exact numbers for yearly block hours these links do provide some great info.

SWA

DAL

Down near the bottom you will find that SWA flew 2,026,134 Block Hrs for 2009 with 5634 pilots. Thats 360 Hrs/pilot x 2 for the 737 = 720 Hrs/pilot for 2009.

If you assume that 10% don't fly for various reasons the number is 800 Hrs/pilot.

Delta's numbers are much harder to extrapolate because of international ops with 3 and 4 man crews.

Delta flew 2,696,379 Blk Hrs in 2009 with 10,785 pilots. That's 250 Hrs/pilot x 2.5 (which is a wag on my part to account for 3 and 4 pilot crews) = 625 Hrs/pilots.

Again assuming 10% don't fly the number is 695 Hrs/pilot.


Now numbers that are much more important.

For 2009 the revenue per pilot at SWA and Delta were almost the same and historically trend close together.

On the other hand Delta's average pilot salary was $138,000 while SWA average was $177,000.

-vpr