Airbnb features a review system in which guests and hosts can rate each other after a stay. Hosts and guests are unable to see reviews until both have submitted a review or until the window to review has closed, a system which aims to improve accuracy and objectivity by removing fears that users will receive a negative review in retaliation if they write one. However, the truthfulness and impartiality of reviews may be adversely affected by concerns of future stays because prospective hosts may refuse to host a user who generally leaves negative reviews. In addition, the company's policy requires users to forego anonymity, which may also detract from users' willingness to leave negative reviews. These factors may damage the objectivity of the review system.
As part of American Airlines’ overhaul project, Terminals 4 and 5 will be redesigned as a single 300,000-square-foot hall with bigger bathrooms, more power outlets and large windows that will allow in natural light. The overall area won’t expand much, but American Airlines officials say a reconfigured ticket counter and check-in area will reduce wait times.
In some cases, passengers may qualify for free checked baggage, but there is a baggage fee for most flights to North America, Mexico, and Central America. On domestic routes, the first checked bag will be subject to a fee of $25. The second bag will be $35, the third bag will be $150, and all additional bags up to 10 will be $200 each. Transatlantic and Transpacific flight passengers may check at least one bag for free.
In November 2012, in the aftermath of Hurricane Sandy, Airbnb partnered with New York City Mayor Michael Bloomberg to offer free housing for persons displaced by the storm. Airbnb built a microsite for this effort alone where victims register for housing and meet property owners with free housing. Additionally, Airbnb waived all service fees associated with these listings while maintaining the Host Guarantee for all properties listed.
Charlotte – American's second-largest hub in terms of number of destinations and daily flights. It is American's primary hub for the Southeastern United States. About 42 million passengers fly through CLT on American every year, or about 115,000 people per day. American has about 91% of the market share at CLT, making it the airport's largest airline.
Airbnb has grown significantly over the last 3 years. To support demand, the company uses 200 Amazon Elastic Compute Cloud (Amazon EC2) instances for its application, memcache, and search servers. Within Amazon EC2, Airbnb is using Elastic Load Balancing, which automatically distributes incoming traffic between multiple Amazon EC2 instances. To easily process and analyze 50 Gigabytes of data daily, Airbnb uses Amazon Elastic MapReduce (Amazon EMR). Airbnb is also using Amazon Simple Storage Service (Amazon S3) to house backups and static files, including 10 terabytes of user pictures. To monitor all of its server resources, Airbnb uses Amazon CloudWatch, which allows the company to easily supervise all of its Amazon EC2 assets through the AWS Management Console, Command Line Tools, or a Web services API.
To help fund the site, the founders created special edition breakfast cereals, with presidential candidates Barack Obama and John McCain as the inspiration for "Obama O's" and "Cap'n McCains". In two months, 800 boxes of cereal were sold at $40 each, which generated more than $30,000 for the company's incubation. It also got the company noticed by computer programmer Paul Graham, who invited the founders to the January 2009 winter training session of his startup incubator, Y Combinator, which provided them with training and $20,000 in funding in exchange for a small interest in the company. With the website already built, they used the $20,000 Y-Combinator investment to fly to New York City to meet users and promote the site. They returned to San Francisco with a profitable business model to present to West Coast investors. By March 2009, the site had 10,000 users and 2,500 listings.