Check out the companies making headlines before the bell:

3M – 3M earned an adjusted $2.58 per share for the third quarter, 9 cents a share above estimates. Revenue fell short of expectations, however, and 3M cut its full-year profit forecast as its results are hit by slowing demand in China and other markets.

Dow Inc. – The materials science company beat estimates by 18 cents a share, with adjusted quarterly profit of 91 cents per share. Revenue also topped forecasts, though sales were down 15% from a year earlier on lower prices.

Twitter – Twitter fell 3 cents a share shy of consensus, with adjusted quarterly profit of 17 cents per share. Revenue also missed estimates. Twitter reported 145 million daily active users during the quarter, better than Wall Street had anticipated, but it also gave weaker-than-expected current-quarter revenue guidance.

Comcast – The NBCUniversal and CNBC parent reported adjusted profit of 79 cents per share, 4 cents a share better than analysts' forecasts. Revenue also beat expectations, helped by robust additions of high-speed internet customers.

American Airlines – The airline came in 2 cents A share above estimates, with quarterly profit of $1.42 per share. Revenue came in essentially in line with forecasts. American put the cost of the 737 Max grounding at $140 million for the quarter, bringing the total to $540 million.

Southwest Airlines – Southwest earned $1.23 per share for the third quarter, 15 cents a share above estimates. Revenue was in line with forecasts. Strong demand and higher fares helped offset the negative impact of the 737 Max grounding.

Stanley Black & Decker – The toolmaker reported adjusted quarterly earnings of $2.13 per share, 10 cents a share above estimates. Revenue was slightly below forecasts, however,  and the company cut its full-year earnings forecast as it implements a cost-cutting program designed to save $200 million per year.

Microsoft – Microsoft reported earnings of $1.38 per share, 13 cents a share above estimates. Revenue also beat Wall Street forecasts, however the company's Azure cloud services grew more slowly during the quarter.

Ford Motor – Ford came in 8 cents a share ahead of estimates, with adjusted quarterly profit of 34 cents per share. The automaker's revenue was slightly below forecasts, and Ford reduced its full-year profit forecast on lower-than-expected China sales as well as higher warranty and incentive expenses.

Johnson & Johnson – J&J cut its previously reported third-quarter profit by $3 billion, to account for the proposed opioid settlement announced earlier this week. However, its adjusted earnings numbers reported earlier remain the same.

Las Vegas Sands – Las Vegas Sands matched Street forecasts, with adjusted quarterly earnings of 75 cents per share. The casino operator's revenue was on the light side of projections, however, pressured by the impact from the U.S.-China trade dispute, which is affecting its Macau operations.

PayPal – PayPal beat Street forecasts by 9 cents a share, with adjusted quarterly profit of 61 cents per share. The payment service's revenue was also above estimates. Payment volume came in above forecasts, and PayPal raised its full-year outlook.

EBay – EBay reported adjusted quarterly earnings of 67 cents per share, 3 cents a share above estimates. Revenue came in slightly above forecasts. The e-commerce company forecast current-quarter revenue that is below Street estimates, however, amid increasing online competition.

Tesla – Tesla reported an adjusted profit of $1.86 per share, surprising analysts who had been predicting a loss of 42 cents per share. Revenue was slightly short of estimates, but the automaker's bottom line was helped by cost cuts and record deliveries.

GlaxoSmithKline – The British drugmaker won U.S. Food and Drug Administration approval for wider use of its ovarian cancer drug Zejula.

Spirit Airlines – Spirit reported adjusted quarterly profit of $1.32 per share, 9 cents a share above estimates. The airline's revenue also came in above Street forecasts. The beat came despite a negative impact from Hurricane Dorian during the quarter. Spirit also gave an upbeat current-quarter outlook.

Align Technology – Align beat estimates by 14 cents a share, with adjusted quarterly earnings of $1.28 per share. The maker of Invisalign dental braces also reported revenue that was above estimates. Align issued better-than-expected revenue guidance for the current quarter.

General Motors – Workers at GM's Flint, Michigan plant voted to approve the tentative labor agreement announced last week. The positive vote at GM's second-largest plant could be an indication that a strike could soon end, with workers across the nation currently in the process of voting on the agreement.