Это говно на первом ангуляре, так что парсить курлом не выйдет, надо через
https://github.com/nesk/puphpeteer
Либо их api дергать:
1. Получаем сессию, ею надо перед каждый запрос брать
curl 'https://booking.butaairways.az/ws/session/getSession' -X POST -H 'Accept: application/json, text/plain, */*' -H 'Referer: https://booking.butaairways.az/' -H 'Origin: https://booking.butaairways.az' -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36' -H 'Sec-Fetch-Mode: cors' --compressed
2. Берем sessionId и дергаем дальше
curl 'https://booking.butaairways.az/ws/flights/weekFlights' -H 'Accept: application/json, text/plain, */*' -H 'Referer: https://booking.butaairways.az/' -H 'Origin: https://booking.butaairways.az' -H 'Accept-Language: ru' -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36' -H 'Sec-Fetch-Mode: cors' -H 'Content-Type: application/json;charset=UTF-8' --data-binary '{"from":"VKO","to":"UFA","departureDate":"2019-09-24","travelersInfos":[{"code":"ADT","quantity":"1"},{"code":"CNN","quantity":"0"},{"code":"INF","quantity":"0"}],"returnDate":"2019-09-24","rt":true,"sessionId":"<Сессия>"}' --compressed