（文章来源：央视新闻） 今年国庆假期，国内旅游呈现出市场下沉的态势，二、三线小城市旅游火爆。中国民航大数据平台航旅 纵横的数据也显示，今年国庆中秋假期，中小机场日均机票预订量同比增幅达18%。国内一家大型在线 旅游服务平台的数据显示，近几天平台上"赏秋""红叶""海边""草原""晒秋"的搜索量环比8月上涨两倍。 这家平台的统计显示，国庆假期赏秋热门目的地包括：四川阿坝九寨沟、喀纳斯所在地阿勒泰布尔津 县、长白山附近的吉林安图县、广西阳朔等地。 ...

Group 1 - The core viewpoint of the article highlights that Tuniu's summer travel report indicates a double-digit year-on-year growth in user travel bookings for both domestic and outbound trips this summer [2] - The report reveals a significant fragmentation in user travel consumption habits, with notable themes such as traditional cultural tours, cool summer escapes, and event-based travel gaining popularity for domestic trips [2] - For outbound travel, family island trips, visa-free travel, and multi-country deep tours are trending among users [2] Group 2 - The report shows that first-tier and new first-tier cities constitute nearly 56% of the summer travel user base, with a notable increase in travel demand from second-tier and lower cities, which saw a nearly 15% year-on-year growth in user travel numbers [2] - Emerging tourist destinations are rapidly gaining popularity, with second-tier and lower destinations experiencing a 24% year-on-year increase in visitor numbers [3] - Traditional popular destinations like Beijing, Shanghai, and Sanya remain at the forefront, while new destinations such as Fangchenggang and Ya'an are becoming sought-after travel spots [3]