No he did not. It only would have been a crime if the CEO of Braniff had agreed and they had implemented the price increases. It was nothing more than Bob Crandall putting his foot in his mouth.
Not exactly. Antitrust lawyer here. The district court agreed with you but the appeals court reversed that decision. The 5th Circuit Court of Appeals disagreed with your assessment and held that AA and Crandall could be prosecuted for attempted monopolization even without agreement by Putnam, who secretly recorded Crandall's call. Crandall wasn't liable for attempted price fixing, but could be prosecuted for the attempted monopolization. Read all about it here:
http://ftp.resource.org/courts.gov/c/F2/743/743.F2d.1114.83-1831.html
Crandall could have been sent to prison had the government filed a criminal complaint (and DOJ wanted Crandall banned from the airline biz for two years), but the DOJ eventually settled for a promise to never do it again in the civil suit, along with some unusual procedures applicable to Crandall and AA for a number of years.
http://articles.latimes.com/1985-07-13/business/fi-9008_1_american-airlines