I have heard that odd numbered Tuesdays in months that contain the letter "R" are safest. But only for airlines whose headquarters are East of the Mississippi River. If their headquarters are West of the Mississippi, the safest days are even numbered Thursdays in months which contain an "R" immediately preceeded by a vowel. This is all true unless of course you are flying internationally during a leap year, in which case you have to call Dionne Warwick at Physchic Friends Network to get a personal chart made.