Spirit Airlines said in court papers filed Monday that it was forced to ground its fleet for good over the weekend because "recent geopolitical events resulted in a massive and sustained increase in fuel prices."While the court papers did not specify the nature of those geopolitical events, jet fuel prices have soared in the two months since the start of the war in Iran."The Debtors and their advisors searched for increased capital and any sources of savings or liquidity, leaving no option unexp