Analysts at Goldman Sachs suspect that many refiners used their spring maintenance cycle to upgrade their equipment in order to handle heavier, dirtier crudes.

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The aircraft carriers that were in the training cycle or undergoing light maintenance were quickly made available for these operations.

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The maintenance track will now become part of the UK's national network of cycle routes.

BBC: Guided bus wheel

The new carrier is also designed to significantly reduce maintenance costs from those of the current Nimitz class of carriers, another major driver of life-cycle costs.

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