What is the fine-grained topic of the following text: Cebu Pacific Promo Fares: The Philippines’ largest national flag carrier, Cebu Pacific (PSE:CEB) offers an50% off seat sale to all its destinations from April 9 to 10, 2011 or until seats last, for travel from June 1 to August 31, 2011. Only return the topic.
Cebu Pacific's 50% off seat sale promotion for 2011