I am quoting an interesting text in Medtronics website "
"You may go through the airport metal detector with your insulin pump and CGM, as these devices are designed to withstand common electromagnetic interference. However, we do not recommend going through an airport body scanner with your pump and CGM, as Medtronic has not determined advanced imaging technology to be safe for insulin pump or CGM devices. If you do go through an airport body scanner, be sure to remove your insulin pump and CGM, but do not send your devices through the x-ray machine as an alternative. If you do not wish to remove your devices, explain to the officer that you cannot remove the insulin pump as it is under your skin with a needle, and request an alternative pat-down screening process."
Dexcoms suggestions are pretty similar. Even though I travel A LOT because of work I always prefer the pat-down procedure, yes it is not nice, yes you have to plan in advance.