FOB is Fuel On Board. Nothing interesting.

Ah that makes sense. Though it certainly doesn’t explain why those messages are worth showing.

Edit: oh they seem like small numbers. Like 24 or 36, I’m assuming hundreds of pounds?

Could it be they are displayed because they have relatively little fuel left?

Example: https://infosec.exchange/@acarsdrama/114196005649300274

Dispatch could correlate it with the jet stream to see if they are getting good fuel consumption. If it's inefficient, subsequent aircraft might plan a different route.

Several years ago I saw a story about the a new record set for fastest Atlantic crossing by a subsonic civilian flight. And due to wind conditions it flew across the US instead of the polar route (it was like LAX to LHW). Basically they just flew with the jet stream and had such a good tailwind they had a supersonic ground speed. 6 or maybe even 700 mph. Their route was much longer than polar but was more efficient because they had a 150 mph tailwind.

Just routine updates to base for routing as needed. Hundreds/thousands of pounds on board. They plan their fuel usage fairly meticulously so base will use it in further calculations.