A droll reply would be, &quot;It&#x27;s a fighter, maintenance is always necessary.&quot;<p>But to give a real answer:<p>If a jet sits for 30 days without any maintenance, then it&#x27;s supposed to be preserved. This means all fuel is offloaded, all lubricants drained and then refilled and then drained again (leaving a film of clean lubricant over important parts), etc. Otherwise, you have to perform an engine run to keep the aircraft nominally flyable.<p>Really, if you aren&#x27;t flying, you are either doing maintenance to prepare to fly, fixing something, performing scheduled inspections, or performing modifications. So if the aircraft is operational, there is no such thing as a 30 day period without maintenance.<p>Without ALIS, you just do all of this via the old paper processes for a while.