An undocumented ceiling, and the only paging on offer
One route showed 58 departure dates out of 181, and the board drew the rest as no flight. The answer was truncated, not empty.
Eleven of thirty six round trip pairs came back holding exactly one hundred records, and never a hundred and one. The worst had fares for 58 departure dates out of 181 and a dash on the rest, which reads as no flight and was nothing of the kind. Asking three times an hour got the same truncated answer.
The service offers no offset and no cursor, so the only paging on offer is by date range. A capped answer is halved and asked again, with four base cases: not capped, a depth limit of three, a floor of fourteen days a slice, and a per tick budget claimed before a split is enqueued. Unbounded, seventy two pairs could reach 1,080 requests in one tick.
Against a captured tick, a sweep of 72 requests becomes 94, settling in two rounds with 38 of the budget unspent.
The part worth recording is what it exposed. Truncation is harmless only because upstream sorts cheapest first, so a day missing from the board cannot be cheaper than a day on it. That is what lets the headline say lowest and mean it, and nothing had ever asserted it. It is a canary now: 2,761 records, no inversion.