And just as airlines can make cheap tickets expensive with lots of additional fees , a jetliner that starts out looking like a bargain may quickly cost more when extras such as onboard equipment get added to the tab , further clouding the actual price .
Such questions are particularly important for rolls-royce , which in the last few years has been buffeted by a series of design and reliability issues affecting engines it supplies for other jetliner types .
Madrid , spain -- spain began three days of mourning thursday for the 153 people who died when a jetliner crashed shortly after takeoff in the nation 's worst air disaster in nearly 25 years .