Put-option volumes on United Airlines and American Airlines in the days before September 11, 2001 were anomalously high relative to baseline, and peer-reviewed analyses found the pattern statistically consistent with informed trading.

Consistent volume figures (SEP-E019) plus two independent peer-reviewed analyses finding abnormal pre-attack activity (SEP-E020, SEP-E021). The published claim is consistency with informed trading, not demonstration of it.

Two peer-reviewed finance journals confirm statistically abnormal pre-attack option activity. However, statistical deviation flags consistency with informed trading without identifying a specific trader, motive, or direct link to the attackers.

Exchange data reflects highly skewed put-to-call ratios for the involved airlines just days before the attacks. Two independent, peer-reviewed finance papers confirm these volumes were statistically abnormal and consistent with informed trading. The strongest opposing consideration is that statistical abnormality only flags unusual volume; it does not identify a specific trader, their intent, or any actual foreknowledge.

Exchange volume data as summarized in early reporting and recapitulated by Snopes, along with two independent peer‑reviewed econometric studies (Poteshman; Chesney et al.), show UAL and AAL put‑to‑call ratios and related trades that are highly abnormal relative to baseline and statistically consistent with informed trading. The strongest objection is that the exact contract counts and dollar estimates originate in press and not raw exchange feeds, and that statistical outliers alone do not identify intent; nonetheless, the existence of unusually large bearish positions right before the attacks is robust.

Reported put‑to‑call ratios of 12:1 and 6:1 on specific pre‑attack days are consistent across multiple secondary sources, and, more importantly, two independent peer‑reviewed finance studies identify statistically abnormal put buying in the relevant instruments. The main caveats are reliance on exchange data not reproduced directly in this file and the generic point that statistical outliers can arise by chance, but taken together the evidence supports calling the volumes anomalous.

Reported exchange volumes show put-to-call ratios of 12:1 in UAL options on 6–7 September and 6:1 in AMR options on 10 September against roughly even baselines, and two independent peer-reviewed analyses (Poteshman 2006; Chesney, Crameri and Mancini 2015) found abnormal pre-attack option activity, with Poteshman stating the finding is consistent with informed trading. The published claim is statistical consistency, not identification of a trader. The strongest opposing consideration is that the specific volume figures descend from September 2001 press reporting of exchange data rather than from a primary exchange record obtained for this case, so those figures and that press coverage are one source, not two.

Circulating exchange figures give put-to-call ratios of about 12:1 in UAL and 6:1 in AMR against roughly even baselines. Poteshman (2006) found unusually high put buying "consistent with informed investors having traded options in advance of the attacks," and Chesney et al. (2015) independently reported comparable abnormal trades. The published conclusion is statistical consistency, not identification of a trader. The strongest opposing consideration is that the specific volume numbers descend from September 2001 press reporting of exchange data rather than a primary exchange record in this file, and abnormality identifies neither a trader nor a motive.

The exchange volume ratios are consistently reported, and two independent peer-reviewed analyses in finance journals found abnormal pre-attack option activity statistically consistent with informed trading. The published conclusion is consistency, not demonstration. The strongest opposing consideration is that the specific volume figures descend from September 2001 press reporting rather than from a primary exchange record obtained for this case.

Two independent peer-reviewed analyses in finance journals (Poteshman 2006; Chesney, Crameri and Mancini 2015) found abnormal pre-attack option activity, and the circulated exchange figures (12:1 and 6:1 put-to-call ratios) are consistent with them. The claim's wording matches the published form exactly — statistical consistency with informed trading, not demonstration — so it asserts no more than the literature supports. The strongest opposing consideration is that the specific volume figures descend from September 2001 press reporting of exchange data with no primary exchange record obtained, making press and figures one source rather than two.

Two independent peer-reviewed analyses using different methods found abnormal pre-attack option activity, with the published conclusion stated as consistency with informed trading rather than as demonstration of it — which is exactly what this claim asserts. Confidence is capped at moderate by a sourcing weakness the case itself flags: the headline 12:1 and 6:1 ratios descend from September 2001 press reporting of exchange data through a secondary carrier, so that figure and that press coverage are one source, not two, and both peer-reviewed findings were verified only from abstracts. The strongest opposing consideration is that no modern re-analysis with false-discovery-rate control has tested whether the detected abnormality survives multiple-comparison correction across the many securities screened.

Two methodologically independent peer-reviewed analyses report abnormal pre-attack option activity, one stating the pattern is consistent with informed trading (SEP-E020) and one detecting comparable abnormal trades across several carriers and Boeing (SEP-E021). The claim is carefully worded to assert consistency rather than demonstration, which is exactly what the sources say. The strongest opposing consideration is sourcing depth: both papers were verified only from abstracts or summary text, the granular figures usually attributed to the second are not in its published body, and the circulating 12:1 and 6:1 ratios descend from 2001 press reporting rather than an obtained exchange record (SEP-E019).

Consistent volume figures plus two independent peer-reviewed analyses finding abnormal pre-attack activity. The published claim is consistency with informed trading, not demonstration of it.