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That would be Boeing with their base in Seattle, Washington and manufacturing plant in Everett, Washington
boing
Boeing Aircraft Company builds the 737 and 747.
Boeing
The Boeing aviation company.
Boeing makes those two models.
Boeing Commercial Airplanes
Boeing of USA and Airbus of Europe Makes such planes and sell to all world airline companies. There are other aircraft companies who makes commercial planes but not as big as 747 or 737.
Boeing
737
737 original: 737 100 737 200 737 classic: 737 300 737 400 737 500 737 Next generation: 737 600 737 700 737 800 737 900
It is a specialized procedure and it is all on the checklists that pilots use. If you can find a checklist for a 737-400 you will find the starting procedure there.