促销，数额有限 ，有使用日期限制。
Tickets for travel between July 26 and September 4, are for sale between 1 and 19 June (or while supplies last).
http://www.diariocordoba.com/noticias/cordobalocal/renfe-lanza-campana-ofertas-ave-a-precios-fijos-adelantar-verano_1046467.html
