Was on two UA757s this weekend. Had loaded up the laptop with movies and tv shows for the 10 hour trip only to find that the power port on the seat required a special adapter. It looked like a cigaratte lighter outlet but smaller. The FA told me they used to sell the adapters on international flights but had nothing on a domestic flight. On the layover checked the airport electronic stores - no one had a clue what it could be. The RCC attendant didn't know what it might be I was asking for but kindly called someone and they told her and she was able to find it by googling for it. But noone in the RCC had one. When I got back home went to Best Buy - no dice. Went to Radio Shack - never heard of such a thing. VERY disappointed at not having power on the flights. Even more that it appears to be an obsolete/unknown type of connector. What do MPrs recommend?