ENCOUNTERS OF AIRCRAFT WITH VOLCANIC ASH CLOUDS: A COMPILATION OF KNOWN INCIDENTS, 1953-2009
Guffanti, Marianne, Casadevall, T.J., and Budding, Karin, 2010, Encounters of aircraft with volcanic ash clouds: A compilation of known incidents, 1953-2009: U.S. Geological Data Series 545, ver. 1.0, 12 p., plus 4 appendixes including the compliation database, available only at http://pubs.usgs.gov/ds/545 .
link to publication's page on USGS website, with links to PDF, .xls files, and .mdb files.