Pre-orders for the new iPad, featuring a Retina display, zippier A5X processor and 4G connectivity, were launched immediately after the product was announced by Apple last Wednesday.
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The California technology giant had promised to ship the first new iPad orders on March 16, but anyone now pre-ordering the device will have to wait until March 19.
According to USA Today, the shipping delays affect all models and price levels, and there is now a limit of just two new iPads per customer for any pre-orders.
"Customer response to the new iPad has been off the charts and the quantity available for pre-order has been purchased," Apple said in a statement. "Customers can continue to order online and receive an estimated delivery date."
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Any customers now hoping to get the new iPad on March 16 will need to queue up at Apple's retail stores, or visit official resellers.
However, there have been unconfirmed rumours that shipments worldwide could be delayed to retail stores from three days to three weeks.
This could mean a potentially long wait for eager Apple fans at the outlets on Friday, although it could also be a clever marketing ploy by Apple.
The company often reports supply delays ahead of new product launches, including pre-orders for the iPhone 4S selling out in less than a day last October.
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