Verizon Communication VZ.N, Abbott Laboratories ABT.N, Tesla Inc TSLA.O, Kinder Morgan KMI.N and IBM IBM.N are set to report their earnings later in the day. By Devik Jain Oct 20 (Reuters) - U.S. stock index futures were flat on Wednesday as investors weighed the impact of supply chain constraints and inflation on corporate earnings, while Netflix shares remained sluggish after its quarterly report. Netflix's NFLX.O global sensation "Squid Game" helped lure more customers than expected, the world's largest streaming service said as it predicted a packed lineup would further boost signups through the end of the year.