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Does economy have to buy their own food ?
Would economy passenger be allowed in the business airport lounge if travelliing with a business class passenger?
Does economy have TV in seat head rests?
a lot depends on a) what airline you are flying; and b) domestically or internationally.
Domestically, almost all economy passengers have to purchase food (unless you are top tier elite at some airlines, like AA). I think some Delta transcontinental flights offer free meals in economy, but those routes are few and far between (I think). AA is in the process of phasing out seatback entertainment, and instead offering streaming services. I think Delta and United are much better in that regard than AA. As for domestic lounges, only members (paying members, credit card holders, even day passes) get access to lounges, except in certain circumstances (AA first and and biz passengers between JFK and SFO/LAX for instance).
Internationally, most airlines offer seatback entertainment and most offer a meal in economy (but not the low-cost carriers). A business class flyer usually gets access to a lounge, and depending on his/her status on an airline / alliance, may be able to bring a guest into the lounge.
Hope this helps.