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All modern wide-bodied jets have been designed to carry many tons of freight, in addition to the passengers and their luggage. A look at the Wiki page of the venerable Boeing 747 will show how it has changed over the 40+ years it has been in production.
(csb: was once flying back from Singapore, overheard the [BA] crew discussing the barely a couple of minutes delay to take-off; a few standby passengers had been 'let down', as someone needed to get a pallet of pc hard drives into Europe overnight, and BA would make money on this freight compared to the minimal marginal return from standbys).
There are very few freight only flights into LHR, they cannot afford the landing slots.
The days of the 'Flying Tigers' cargo-only 747s being an everyday feature at LHR are long gone.East Midlands airport has built itself a reputation as the UK's premier airfreight hub for the likes of DHL/UPS etc.
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mespilus
Seems likely - maybe is was considered but would a 'freight only' airport be something that was possible, take it all out of heathrow (more space for passengers) and stick it in a more specialised airport somewhere (specifically, somewhere else where they won't start flying over my house :))