I've actually just graduated from Loughborough in Materials engineering and was also considering a masters in air transport management at loughborough or surrey in 2019. In terms of employability, loughborough is ranked very highly (higher than surrey in the UK) and is a top 5 uni so I don't think you should make your decision on those aspects. The advantage surrey has is that it is closer to London airports, however loughborough is only 20 mins away from East Mids Airport. Overall, I'd say you should decide based on where you'd like to live and which campus appeals to you more. Surrey is a great campus but loughborough is slightly better in my opinion being the largest in the UK. If you're interested in other things like sport consider which uni would be best for you in terms of that. Overall the only reason I'd choose surrey over loughborough is to put myself out of my comfort zone and experience another uni environment after being at luffs for 4 years. I couldn't decide between them in terms of the course as they seem very similar.