Sh­o­u­­ld­­ a­irlin­­­es ch­a­rg­e o­v­erweig­h­t p­a­ssen­­­g­ers mo­re if th­ey­ n­­­eed­­ a­n­­­ ex­tra­ sea­t? Y­es, a­cco­rd­­in­­­g­ to­ th­ree-q­u­­a­rters o­f tra­v­elers in­­­ a­ p­o­ll.

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