Duty period, rest, and the repositioning trap
If you're not considered a flight attendant in the safety sense — the pilots are — then what does that actually mean for your flight time? It means a company can schedule you to fly for the entire length of your duty period, because there's no formal limit stopping them. If the pilots are on legal rest, you probably aren't flying either, since someone still needs to fly the aircraft.
But what happens when the operator has you commute between aircraft instead, repositioning as a passenger? That's exactly where it gets tricky. In the operator's eyes you weren't flying that day, so it counts as rest. You spent it in airports and in the back of someone else's cabin, and it goes down as a day off.
Some companies have internal policies that look reasonable on paper. Short of crew, though, those policies tend to bend fast. Some push further still: landing you on what was supposed to be your day off, or starting your next duty on the last day of the one you were owed. Flexibility is genuinely part of the job. It shouldn't come at the cost of your rest. This doesn't apply to all operators.
The same creativity shows up in how some operators handle HR rules more broadly. Read your contract carefully on vacation specifically. Some operators require you to take your holiday out of your existing days off, meaning you have no separate legal vacation entitlement at all. It sounds like a technicality until you see how it plays out: they'll let you swap days off with colleagues to build a longer break, which sounds generous — and then you find you've flown six weeks straight to earn one month away. You didn't get a month of vacation. You front-loaded the work and called it leave.
Here's what that looks like in practice: nine consecutive days of flying and repositioning, no real break in between. Day ten only became a rest day because someone said out loud that they were too tired to keep going. That's the part worth sitting with: the rest wasn't scheduled, it was granted, after the fact, because a person raised it. That's not a rare edge case. It's what happens when nobody outside the operator is checking, and when the crew member in the seat has no formal duty-time protection to point to.
A rest day you had to ask for is not the same as a rest day you were entitled to.