Frequency Eight a day from Heathrow to JFK,
three a day from Heathrow to Newark.
Leg room 14/17 private cabins (depending on aircraft type) each with a 6'6", fully flat bed.
Price A first-class return is £4,359.
Convenience "Fast-Track" customers can access a dedicated security channel, to speed their journey to the departure lounge, plus a dedicated channel through immigration, reducing the amount of time taken to exit the airport.
Food and drink Typical menu items include roast onion soup and a foie gras and duck confit.
Extras British Airways has a spa for first-class and Club-World customers at the new Terminal 5.
Carbon cost 1.164 tonnes per passenger. BA charges an additional £16.60 to offset your emissions.
Green*** Luxury **** Value ***
Frequency Luton to Newark, twice a day.
Leg room There are 100 6'3" flat-bed seats on board, with a pitch of 60 inches (152cm).
Price A business-class return is £1,099.
Convenience Passengers can arrive at the terminal to check-in 30 minutes before take off (45 minutes for customers with luggage to check in).
Food and drink The menu includes endive salad with figs and shaved pecorino.
Extras Silverjet has its own 9,000 sq ft private terminal at London Luton airport and offers complimentary chauffeur transfers.
Carbon cost 1.5 tonnes per passenger. Silverjet offers a carbon off-setting option, which is included in the ticket price. Silverjet became a carbon-neutral company in 2006.
Green *** Luxury *** Value *****
Frequency Whenever you need it, from airports including Luton, Stansted and Farnborough to White Plains, Westchester, Teterboro, Newark and LaGuardia.
Leg room Plenty. Some of the jets have separate rooms for meetings, or TV/Playstation areas.
Price £55,000 to £70,000 depending on choice of jet.
Convenience If the passengers are either US citizens or they have a US visa then the jet can be ready "within a few hours". Passengers can arrive five minutes from scheduled take-off.
Food and drink Clients can request whatever they wish. Also includes a fully stocked bar.
Extras Private lounge transfers by limo or helicopter.
Carbon cost 3.06 tonnes per passenger. Cloud9 is carbon neutral and offsets at its expense all the carbon emissions for all flights.
Green ** Luxury ***** Value ****