extended taxi…
with both engines running, can eat up a lot of fuel. Delays waiting for a gate, circuitous taxi route. Once, long ago, at Rome FCO, surrounded by thunderstorms, broke off the approach, headed for alternate, but ATC said FCO was okay, and visually I could see the storms had passed, so we turned back. (joint decision) by the time we got to the gate, we had gone well below final reserve. Would this current incident have had to have the fuel qty electronically transmitted upon landing? Thankfully, the event mentioned above, did not trigger any alerts; on a classic 737. I “added” some fuel when writing in the logbook.