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# <input type="checkbox" name="search_first_class">
# <input type="checkbox" name="search_economy_class">
...
   . ($search_first_class   ? ' First'   : '')
   . ($search_economy_class ? ' Economy' : '')
) if $DEBUG;

# <input type="checkbox" name="search_class" value="first">
# <input type="checkbox" name="search_class" value="economy">
...
#    . ($search_class{'first'  } ? ' First'   : '')
#    . ($search_class{'economy'} ? ' Economy' : '')
# ) if $DEBUG;