Six planes "full of robots and equipment" were flown in to Tesla Inc.'s battery factory outside Reno, Nev. from Europe on a costly bid to speed up battery production for Tesla's Model 3 mass-market sedan, according to a Reuters report Friday that cited people familiar with the matter. Tesla has declined to comment, according to the report. The shipments began arriving this week but it was not clear when the new system would be ready, Reuters said. Tesla shares were poised to end the week flat, contrasting with a 0.1% advance for the S&P 500 index.