Of course, trains can't run 24 hours a day and the companies don't want to run empty trains.
"We don't want sites standing empty, we get no benefit, no credit from having sites empty, " he said.
Sure, you don't need to waste fuel flying around an empty airliner, but even the company's small jet can burn through quite a bit of cash.
ENGADGET: Visualized: JetBlue and ViaSat test Fly-Fi in-flight WiFi... from the ground
"A lot of parents don't want to put their babies in an empty crib, " says Catherine Hall, the founder of Mothers Investigating Safe Sleep Options for Newborns, a Boston-based nonprofit group.
Responsible people don't like to be in the position of making empty threats like that.
Someone who lives in an empty or abandoned building which they don't own or rent without the owner's permission.
And when you come home from a long day at work, and the refrigerator is empty, and you know you don't feel like cooking -- (laughter) -- the easiest and sometimes the cheapest thing to do is to get in a fast food drive-thru.
"I don't want to see the land and the building stay empty and broken, " one parent said during a town hall meeting Sunday night.
It is far easier to overlook the death of loved ones when you don't have to stare across the holiday table at their empty places.
However, Libya's armed forces don't have the high-tech aerial equipment necessary to survey the miles of empty desert.
And, in leaving his corporate chair empty, Benedict has assured the members of the corporation: Don't worry, you are in Jesus's hands.
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