Very glad if it ends up helping at all.
Also, I didn't see any mention of this in this forum or your PDF, so forgive me if I'm telling you something you already know. And I don't want to get you all excited about what may be nothing.
However, ALPA's archives are not with NARA. Instead they chose Wayne State University as their repository. As before, I can't post a URL, but try
reuther[dot]wayne[dot]edu[slash]taxonomy[slash]term[slash]9
and if that's incomprehensible look for the Walter P. Reuther Library site, Collections.
I didn't see a direct reference to this crash in the (admittedly few) collection descriptions I skimmed through. But there are a lot of records, with a descriptive PDF for each sub-collection within the ALPA group. And there are definitely documents and correspondence from 1961 and 1962, though the catalog is not necessarily specific enough to trust with regard to details of every document in every box. And none of it appears to be digitized, so you'd be in for a long, dusty slog through a ton of old paper.
Still, on the off chance it might help.
Cheers,
c