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American Airlines (AAL) closed at 0.86% lower on October 10, 2025, with a trading volume of $0.84 billion, representing a 29.88% decline from the previous day’s volume. This marked the stock as the 156th most actively traded security in the U.S. market on the day.
Analysts noted the volume contraction could reflect reduced short-term investor engagement ahead of key earnings reports or regulatory updates. Sector peers showed mixed momentum, though no direct catalysts were cited for American’s performance. The decline aligns with broader sector volatility observed in recent sessions amid shifting fuel price dynamics and evolving labor negotiations.
To run this study rigorously I’ll need to pin down a few practical details: 1. Universe • Which market do you want me to scan for the “top-500-by-volume” list each day – U.S. listed stocks (NYSE + NASDAQ + ARCA), only the S&P 500 constituents, or another universe? • If you prefer “all U.S. common shares,” do you want to exclude micro-caps, ETFs, ADRs, etc.? 2. Execution convention • Buy at the day’s close and sell at the next day’s close (standard close-to-close test)? • Or buy next-day open and sell that day’s close (open-to-close)? 3. Transaction costs / slippage • Should we assume zero, or apply a per-trade cost (e.g., 2 bp in+out)? Confirming (or adjusting) these items will let me generate the signals, feed them into the back-test engine and return clean performance statistics.

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