I've flown from USA to NRT to BKK and then BKK to DXB with 2 new Macbook Retinas and a Samsung Series 9, all brand new but out of the boxes (1 personal & 2 work). Other than a few laughs at the security checkpoint in BKK and a few odd looks from other passengers in USA (PHX/MSP) for needing 5 x bins for all my computer HDD's and cameras, there weren't any issues at all. By the way, can always check the cables etc in luggage to lighten the load!