I have a pump, a medtronic paradigm . Its about the size of a pager and to most people probably looks like one, it clips on a waistband, in a pocket etc, I think that most of the pumps are much of a muchness sizewise. I've only had one journey through airports with it but had no problem, certainly no more than having to tell security that you have lancets and needles in you hand luggage.
I also run, but my reason for having the pump is the opposite to your husband. I go low during and after runs. I've only had the pump since April and am still experimenting but being able to reduce insulin delivery to a trickle is fantastic, as a result I've lowered total insulin dosage and reduced hypos. Although it doesn't normally get in the way when running I have had a couple of times when it has been annoying and uncomfortable. You change the site of the catheter every 3 days and its a matter of finding which places work or don't work for you.
Your husband would be able to raise his basal if necessary during and after longer runs so help to reduce the highs
Pumps aren't however self regulating and they only work well if the person is prepared to take the time to work out carb/insulin ratios and basal rates for different types of activity. If someones not really motivated I doubt that there would be a huge benefit.
There is also no doubt that it is always there,even though I wanted to start using one I love it when I take it off to go swimming.
Finally, I don't know if you have looked at the runsweet website. This has been revamped recently and on the front page are 2 things that might be of interest.
1)Do you have problems with your diabetes and sport? If so ask your G.P. or consultant to refer you to our (England's only) specialized diabetes and sport clinic
2)Would you like to help find out which strategies best support exercise in diabetes? We have started a study using CGMS to help with glucose control during sport, can you help? If you are interested, fill in the guestbook form and we will send you further details.
http://www.runsweet.com/index.html
edited to add. I don't live in the UK, I doubt very much that I would have got a pump in the UK