Reminds me of the old Mitch Hedberg joke:

"I saw a billboard for the lottery. It said, "Estimated lottery jackpot 55 million dollars." I did not know that was estimated. That would suck if you won and they said, "Oh, we were off by two zeroes. We estimate that you are angry."


But on a more serious note, it's probably because the days each plane is out of service varies and it seems like it is a variable payout based on that. From the SEC filing: "The estimated impact of the Agreement on Spirit’s liquidity is currently expected to be between $150 million and $200 million, primarily determined by the number of days accumulated in 2024 in which Spirit aircraft are unavailable for operational service due to GTF engine issues."