Originally Posted by
LoyalToTheDollar
I fly regularly between MDW and SJC/SFO, but have never noticed a fuel truck servicing the plane. Then again, I haven't gone out of my way to look for it

I will have a closer look before my flight tonight.
Many larger airports utilize fueling hydrants in which a short hose connects the ground fueling port to the airplane's. At PHX, there is a spur pipeline that runs from the main transcon pipeline tank farm on 59th Ave directly to the airport, so no trucks anywhere in the process.