I leave it to you to decide whether the result is significant. Here's what emerged:
- Total respondents: 91
- Respondents self-identified as "left handed": 30
- %'age of "left handed" respondents: 32%
- %'age of the general populace "left handed": about 10%
- Factor by which left handed pilots exceed general incidence of left handedness: about 3.2X
As vulnerable as this query is to confounding factors, it's hard to imagine a scenario that would explain away the entirety of excess left handedness among pilots reflected in the data. I have to conclude that pilots are, to a significant degree, more often left handed than "normal people."