Whatever the cause, the message for exhausted elderly travellers would appear to be: if you must fly, head west.
En route to their destination, planes must fly over the control centers instead of a straight line, wasting fuel and time.
Some flight schools reacted immediately to the new threat of dangerous student pilots who, at some point, must fly alone to pass tests.
Within the R160 controlled area, for example, they must fly above the River Thames, which minimises the risk of crashing into a built-up area.
BBC: London helicopter crash: What are the rules for pilots?
If tenants vacate your home and you must fly down to Florida to do regular maintenance, for instance, you can write off your travel and meals as a business trip.
Smartphones make it easier for managers to change their minds at the last moment: for example, to e-mail a minion at 11pm to tell him he must fly to Pittsburgh tomorrow.
To get to Estancia Colome, an expansive Argentine ranch that sits 13, 125 feet above sea level, you must fly into Salta City and endure a bumpy five-hour car ride through the Andes.
They have room to do it, thanks to the popular service, leather seats and television screens that make JetBlue a must-fly for so many passengers.
He flies out to Ireland on Sunday for a Monday training session with his international colleagues and must then fly back to play in Newport's league clash with Llanelli on Tuesday night.
The President also must weigh carefully whether to fly back from DC to Oahu if his vacation is again interrupted by a budget crisis.
To enable that to happen we must have the courage to fly revolutionary ideas (propulsion and launch methods), not just build more of the old design concepts.
However, under the terms of the tender, the initial 18 jets must be supplied in a fly-away condition between the third and fourth year of signing of the contract, he said.
WSJ: India Still to Finalize Terms for Jet Deal With Dassault
Same story: you must have a passport to fly.
FORBES: Evidently Delta Never Got the Memo On America's Express Border Crossing Program
Stephen Jones' kick-off epitomised the Scarlets' season thus far - off kilter as the ball ran dead, bringing a scrum on half-way at which the Wales fly-half must have been relieved to see a free kick awarded against Ulster.
With a grassy hollow guarding the left front edge and sand at the right front edge, to get close you must wriggle in between the traps or fly over and pray for a soft landing.
Check the rules before you fly, but currently, liquids must be carried in 100ml bottles and stored in a clear plastic bag that holds no more than one litre in total.
You must have the capacity to problem solve on the fly and be comfortable taking risks despite lots of unknowns.
For such a case to fly, Judge Kelley said, TruePosition must come up with direct evidence of a conspiracy, such as memos detailing discussions among competitors.
FORBES: Judge Dismisses TruePosition Case -- With Invitation To Try Again
It's even more chaotic for Big Lots, which must be able to make a deal on the fly and receive huge shipments--270 trailers of Mead paper supplies, say--within days.
The team must be trained to be dynamic and adjust the plan on the fly.
Americans may neither fly direct to Cuba nor spend dollars there: their Cuban hosts must pay all their expenses.
Clear and purposeful programmatic objectives and milestones must be established, including a decision now to build a useful prototype aircraft to fly by 1995.
He cannot open the fist to look at the thought, for fear that it will fly away, but he knows that it is very important and that he must hang on to it, no matter the cost.
But only Turkish or Turkish Cypriot airlines can fly to the north's rather mournful airport at Erecan, so foreign holidaymakers must pay a lot more by travelling via Turkey.
Before that money can materialise, however, Washington state's members of Congress must stop squabbling, which may happen at about the same time as salmon sprout wings and fly over the dams.
And I suspect that must be, A, hard to believe, because we don't always see our time fly as we live it.
Also, if you are combining an e-ticketed flight on Carrier A with a traditionally ticketed flight on Carrier B, on the return leg, you must present the voucher to Carrier B to prove that you have a valid booking on Carrier A to fly out of your next stop.
"By partnering with SES, Gogo aims to provide the reliable and seamless satellite coverage our current and prospective airline partners must have to meet airline passengers' demands for high-quality, high-speed Internet access on the fly, " said Gogo president and CEO Michael Small.
ENGADGET: Gogo spreads its in-flight WiFi wings further with SES satellite deal
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