A plane hold's 180 people...add $1/$2 per ticket and that's $180/$360 in revenue. If WiFi was $10, that's 18-36 folks. Judging from the number of peopel carrying laptops on board, I doubt you'll exceed those numbers on most flights (especially short flights). So a minor $1/$2 fare hike (not even noticable) would likely generate excess revenue and allow Southwest to offer "free WiFi" which would be one heck of a marketing tool..
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