IVE GOTTON SOME GOOD THOUGHTS, BUT STILL CANT FIGURE OUT WHY THE AIR% AT THE END OF MY HOSE IS WAY HIGHER THAN OUT OF THE CONCRETE TRUCK WHEN I'M LINE PUMPING NON-AIR CONCRETE.  DOES ANYONE HAVE ONY OTHER THOUGHTS ON HOW THE AIR IS GETTING ADDED TO THE CONCRETE.

Water getting by the cups from the water box

From the chute and open to air action at the agitator?

when transferred from mixer to hopper hopper to material cylinders and when being discharged from placing hose.

Test cylinder analysis will give you a better read on air %. Air trapped in sample is my guess. What do finishers say.