The only people I have tripped with who would fit that moniker are those who really did not want to be there anyway.  Unfortunately, I did not learn of this mentality until we met at the Minneapolis airport.  In hindsight, her statement upon arrival at the airport, "Don't get used to this, because you'll never see me up here again" was not just exasperation at flights and travel stress, but an overall attitude that would only become worse as conditions fell off from ideal.  I should have put her friend and her back on the next flight home!