first post was main airline website. this post will be conditions/contract of carriage.
AA >
oct 20 2010 >
https://web.archive.org/web/20101020...OfCarriage.jsp
cannot exceed any of the following measurements
so added before then, but after mar 26 2010, where it does not appear >
https://web.archive.org/web/20100326...fCarriage.jsp?
AA only added personal item size to main website, not conditions of carriage.
but AA did go with US >
http://www.aa.com/i18n/customerServi...OfCarriage.jsp
after June 11, 2014, the personal item does not have specific size requirements
UA >
https://web.archive.org/web/20120814...f_Carriage.pdf
revised August 1, 2012
Carry-on Baggage...may not be longer than 22 inches in any single dimension.
Personal items must not exceed 36 linear inches...and may not be longer than 17 inches in any single dimension