On January 21, Boeing (BA) announced it does not expect regulators to approve the return of the grounded 737 MAX aircraft until mid-2020, erasing hopes of a first-quarter recertification. Boeing, under new CEO Dave Calhoun, now appears to be taking a more conservative approach to both its relationship with global regulators and its communications with Wall Street. However, continued slippage in the MAX's return-to-service timeline creates growing anxiety for income investors as Boeing's liquidity comes under greater pressure with each passing month.

Founded in 1833, Royal Dutch Shell (RDS.B) is one of the world's largest integrated oil companies with operations in over 70 countries. In addition to exploring for and extracting crude oil, natural gas, and natural gas liquids, Royal Dutch Shell owns a number of refineries, distribution terminals, and LNG tankers.Shell organizes its business into three operating segments: Integrated Gas (44% of earnings): manages liquefied natural gas (LNG) activities, including exploring for and extracting natural gas, converting gas into LNG, and delivering LNG to end markets Downstream (29% of earnings): refines crude oil to produce ready-to-use fuels like gasoline and diesel, and sells petrochemicals for industrial use

Public Storage (PSA) was founded in 1972 by two California business men who invested $50,000 in a single storage unit initially to generate temporary income. PSA, America’s largest self-storage REIT, now owns close to 2,500 storage rental properties in 38 states and seven European countries. Approximately 81% of the REIT's properties are in the U.S. and account for the majority of its cash flow. Here is Public Storage's breakdown of revenue and net operating income (NOI):

Formed in 1870 as part of business magnate John D. Rockefeller's Standard Oil empire, Exxon Mobil (XOM) is one of the world’s oldest oil companies. The firm has evolved from a regional refiner and distributor of kerosene used in lamps to the largest publicly traded petroleum and petrochemical enterprise in the world.  The firm's products drive transportation, power cities, lubricate industry, and provide petrochemical building blocks that are behind a wide variety of consumer and industrial products.  Exxon organizes its business into three integrated segments:

CVS Health (CVS) was founded in 1963 with three Consumer Value Stores located in Lowell, Massachusetts. It has grown into the second largest drugstore company in the US with close to 10,000 retail locations. CVS is also one of the nation’s largest pharmacy benefit managers and health insurance providers, positioning itself as a uniquely diversified and vertically integrated player in the health care industry. CVS organizes itself into three business segments:

Founded in 1954, Pembina Pipeline (PBA) is a major transportation and midstream service provider with a network of oil and gas pipelines, storage facilities, and processing plants located primarily in western Canada. The firm's energy infrastructure helps the hydrocarbons produced in western Canada reach the highest value markets throughout the world.

Founded in 1906, ONEOK (OKE) is a leading U.S. midstream service provider focused on natural gas liquids (NGL) such as butane, ethane, propane, and pentane. These liquids are generated when natural gas (methane) is produced. NGLs are used as feedstocks for petrochemical plants (to produce plastics, rubber, etc.), burned for heating homes and cooking, and blended into vehicle fuel. Many NGLs are also exported to higher-cost markets in Europe, China, and India. With a network of pipelines, processing plants, fractionators, and storage facilities, ONEOK connects growing NGL and natural gas supply with key market centers.

With roots going back to 1849, Walgreens Boots Alliance (WBA) is one of the world’s largest pharmacy retailers and drug distributors, operating over 18,000 pharmacy stores around the world.The company operates a portfolio of retail store brands, including Walgreens, Rite Aid, Duane Reade, and Boots, as well as global health and beauty product brands, such as No7, Soap & Glory, Liz Earle, Sleek MakeUP, and Botanics.In addition to its retail business, Walgreens owns distribution centers that deliver drugs to pharmacies, doctors, health centers, and hospitals. The firm is also one of the world’s largest purchasers of prescription drugs and other health and wellbeing products.

Founded in 1997, Kinder Morgan (KMI) is one of North America's largest midstream infrastructure companies, providing gathering, storage, transport, and processing services to the oil & gas industry. As you can see, Kinder Morgan's pipelines, storage facilities, and terminals are integrated into almost all parts of the domestic oil & gas industry, including every major gas and oil shale formation and export markets along the Gulf Coast.

Energy Transfer LP (ET) began in 1996 as a small natural gas pipeline operator in Texas and has grown to become one of the largest providers of midstream energy services in the nation. With a footprint in most of the major domestic production basins, the firm's pipelines, storage facilities, and terminals help move various fossil fuels from production sites to end users.