The latest data point for Archer Aviation Inc. (ACHR)'s Operation Income in Q4'25 shows a loss of $234.4M USD, marking the deepest quarterly deficit in the observed period from Q1'23 to Q4'25. This represents a year-over-year (YoY) decline of 88.7%, indicating accelerated operational losses compared to the prior year. Over the timeframe, Operation Income has consistently remained negative, with losses fluctuating between $46.2M and $234.4M USD, reflecting an overall worsening trend driven by escalating expenses in the aviation sector. Notable improvements occurred in Q3'23 (loss of $46.2M USD) and Q2'24 (YoY growth of 33.2%), but recent quarters show deepening deficits, with YoY declines averaging around 40-50% in 2025, underscoring persistent challenges in achieving profitability.