Yes, a 5'4" (163 cm) male can absolutely be a flight attendant. Most airlines have a minimum height requirement rather than a gender-specific one, typically ranging from 5'0" to 5'3" (152–160 cm). The primary reason for this rule is safety; you must be tall enough to reach the emergency equipment in the overhead bins and close the heavy cabin doors. Many international carriers, such as Emirates or Qatar Airways, use a "reach test" where you must be able to reach 212 cm (approx. 6'11") while standing on your tiptoes. At 5'4", most men can comfortably pass these requirements. Some airlines also have a maximum height (often around 6'3" or 190 cm) to ensure the crew doesn't constantly hit their heads in smaller aircraft cabins. As long as you are physically fit, have a proportionate weight-to-height ratio, and meet the customer service criteria, your height should not be a barrier.