I doubt you even have a brother that works in this area, but I'll humor you. Your brother's employer may not challenge these cases, but many other employers do. The law is clear: if you engage in activities at work that aren't part of your job, then you are not entitled to worker's comp payments. Your employer may be benevolent enough to let you get by with it, but if they decide to challenge your claim, then they'll win. Since most airlines aren't exactly benevolent, then good luck on them not challenging you.
You can doubt all you want, but as long as you are working for the same employer, and doing "work" i.e. not choking on a hot dog at lunch, then you are covered. That is the rule in this state, and many others, whether you are covered by the state worker's comp program, or are privately (or self) insured. I do not need your humor. I deal in facts. Ask the worker's comp manager at your company.