Chaos,
Busses tend to stop every now and again, allowing people to strecth their legs. Other busses have seats that convert into beds for long overnight drives.
Pulling a 747 over mid-atlantic is not seen very often, and so far only 1st and C class pax have the luxury of beds. I cannot imagine any airline offering that on steerage without a considerable surcharge, and then maybe in A380's only. Would anybody then pay for it, if the price is only slightly less than full-fare business ?
DT