http://www.detnews.com/article/2011...it-boosts-online-fee-to-book-domestic-flights Florida-based Spirit Airlines, the only airline in the nation to charge passengers for carry-on luggage, now charges nearly $34 to book a round-trip flight online. Spirit has long promoted itself as the ultra low-budget airline that offers fares as low as $9 each way. But the airline also boasts one of the most extensive lists of extra fees in the industry. Earlier this month, Spirit raised the "passenger usage fee" from $8.99 for one-way domestic flights to $16.99. The fee for international flights dropped from $18.99 to $16.99. The only way to avoid the fee is to buy a ticket at an airport counter. But as of Jan. 24 the airline will charge passengers $5 to print out a ticket at the airport counter. The airline announced in August 2010 new fees to stow a bag in the on-board overhead compartment, plus charges to check luggage in the cargo area.