put up wheel chair request at time of booking and PNR & E-ticket have WC_A prefix for it [ insist for it again at check-in counter if journey starts from any Pakistani airport ] anywhere else they ensure you get wheel chair unless passenger decline it,
Passengers with wheel chair assistance are entitled for bulkhead seats by default according to IATA ruling.
& across Atlantic flight planes have better seat configuration in coach, compared to flights operating for under 4 hour distance