US futures are indicating a flat open as of 05:00 ET. European equity markets higher, with travel stocks benefiting from report on UK's updated travel list and plans for simplification of rules. Asia trading was mixed with focus on China's Evergrande. Some eyes on quadruple witching on Friday. Companies mentioned: Boeing (NYSE:BA), Evergrande (HK:3333), Diamondback Energy (NASDAQ:FANG), Biotest (DE:BIOG), Commerzbank (DE:CBKG), Grifols (NASDAQ:GRFS), State Street (NYSE:STT), Invesco (NASDAQ:QQQ).