Final answer:
Passengers are not allowed to bring lighter refills like butane on board an aircraft. One small disposable or Zippo lighter with a safety cap is typically permitted on a person or in carry-on baggage, but torch lighters or lighters without a safety cap are banned.
Step-by-step explanation:
The question relates to what a passenger is allowed to bring in terms of lighters or lighter fuel on an airplane. According to the regulations of many airlines and the Transportation Security Administration (TSA), passengers are not allowed to bring lighter refills such as butane or lighter fluid on board an aircraft, either in checked or carry-on baggage. However, a passenger is typically allowed to carry one lighter on their person or in carry-on baggage, but it must be a disposable or Zippo lighter and the safety cap must be on. Torch lighters or lighters without a safety cap are strictly prohibited.