I would sell it to united.com; on its own, there may be a fail on the radio test? But yes, a great LLL .com for sure.
Ironically, I'm actually connected to the CEO, 'Scott Kirby,' at United Airlines! It would certainly make a great addition to their family as a shortener.
I've considered various usage ideas for myself, such as a (UTD) clothing brand, a social/sports platform, and even a Domain Registrar/Hosting Company. Who knows, if I don't sell it, one of those ideas may come to fruition in the future.
Moreover, I feel that with the Middle East and the UAE positioning itself as a sports epicenter with events like the Dubai World Cup, Abu Dhabi Grand Prix, and Dubai Rugby Sevens, a domain symbolising unity, collaboration, and collectiveness, like UTD.COM, appears ideally suited for a nation aiming to consolidate/unite all sporting endeavours.
Alternatively, it could work well for a presidential campaign/body in the United States or, again, something sporting related. The domain lends itself to a multitude of businesses and is a genuinely powerful three-letter combo.
Hopefully, others will see the potential of this name too.