Save Aircraft

Not sure if this has already been suggested, but having the ability to save an aircraft in the app that you've spotted would be a cool feature. Living in Kent we get a lot of Spitfire flights and occasionally we get other 'heritage' aircraft flying over. Would love to be able to spot a plane on the radar and jump into the app to save it and get a notification when it's within X amount of miles. Would save the last minute running outside and spotting them when their already gone!