Fuel gauges.
Why is it that in every aircraft I have flown I do not have an accurate or RELIABLE way of knowing how much fuel I have in the tanks? Im not talking about fuel planning, but how has technology moved on so far and left fuel gauges in the past.
I say "fuel sufficient" only because I know that I am flying around with 4/5 times more fuel than I actually need because the gauges cannot be used and no matter how well you try and calculate fuel burn, the actual will always be different.
Put a fuel gauge in aircraft that works and I can use please.