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Will I have to work shifts? medication used to treat erectile dysfunction Ryanair and Spirit Airlines (a U.S.-based carrier that charges passengers for overheads) are often at the forefront of new fees, according to Chris Lopinto, president and co-founder of ExpertFlyer.com, a website that helps frequent flyers monitor their flight awards and upgrades. Watching those airlines can offer a glimpse of the fees other carriers may implement in the future, he adds.