Passengers aboard flights on two leading airlines,Delta Air Lines, Inc.(NYSE:DAL) andAir Canada(OTC:ACDVF), were recently confronted with situations involving bodily fluids, leading to some real discomfort and tough choices.

What Happened:On an Air Canada flight from Seattle to Montreal on Aug. 26, two passengers were reportedly asked to sit in seats that were wet with vomit. According toSusan Benson, a passenger on that flight, the issue had been caused by a prior passenger who had vomited on the preceding journey.

"There was a bit of a foul smell but we didn't know at...