I have used a pump for 11 years and have rarely been asked about it. I either have it clipped to my pants or skirt, or in a pocket. It does not alarm.
I would be extremely concerned about wearing it in either type of Xray imager at the airports-the pumps even have a warning sticker about wearing it in radiation devices like an MRI or a CT scanner. The manufacturer,Medtronic, was unable to give me advice as to the safety of the pump in these devices. I have not yet been in an airport with these WBI,but I will not take the chance of it destroying my pump and I also will not take my pump off-it's a medical device,after all.
I also wear a continuous glucose sensor which may not go through Xray either and must stay within 5 feet of my pump. I plan to never fly via Heathrow with their draconian no exception rules to opt out of the WBI.
Don't even get me started about the danger of taking my shoes off on a dirty public floor,unable to protect my feet. Those "shoe covers" are no protection either as they are made of paper.