Most Popular Promotional Offers For Online Travel Websites

What kind of promotional offers do customers expect from the online travel agents websites? A little study by About.com revealed the following results (based on percent of respondents)

Discount coupons on airfare : 70%
Discount coupons on hotels : 67%
All-inclusive packages : 49%
Discount coupons on activities and food : 49%
First time buyer discount programs : 40%
Repeat buyer discount programs : 28%