Q: How do I sync my I phone 5 Apps to Macbook air and then upload to new I phone 6?

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If you will continue to use both devices, follow these instructions to download the apps to your computer, then sync them to the new iPhone 6: Redownload or transfer your iTunes Store purchases from an iPhone, iPad or iPod to a computer - Apple Support

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If you are replacing the old device, follow these instructions: Transfer content from an iPhone, iPad, or iPod touch to a new device - Apple Support