65 squadron flying P51C's at the same time as JEJ had the drop tanks modified (inside coating) to carry ale. One carried dark ale, one carried bitter. So, a lot more beer in each run.
Both parties claim to have had the merriest mess tent on the front, and as far as I know they never knew about each other.
I put my money on 65 sqn since they carried a lot more in each run. The job was unpopular though, since landing with full DT's was a wee tricky, and if the pilot made a rough bounce and spilled the ale, he was in for a load of trouble....