It sends shoppers who have opted in the service real-time deals via text message as they enter the shopping center no apps, check-in or printed coupons necessary.

FORBES: 'Tis the Season to Give Shopping Malls the Shaft

If they don't have a frequent-flier ID card, travelers check in online or at kiosks and get a bar code on a printed boarding pass or on a mobile phone, just like at other airlines.

WSJ: Flying Through the Airport

Meanwhile, motorists in the UK have been warned to check online MOT certificates when buying a car, rather than looking at a printed out version.

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