Southwest Airlines has introduced its "Sip and Ship" program, which will allow passengers to check one case of wine at no cost when flying between Santa Rosa and select West Coast locations, including San Diego. The program is part of a celebration of the inauguration of Southwest’s new nonstop destination, Santa Rosa. Each passenger can check one wine at an additional charge if cases are placed in a standard wine shipping box or wine suitcase that meets checked bag requirements. The service is available in select cities including San Die, Las Vegas, Denver and Burbank. The new program comes amidst increasing air travel costs due to the ongoing conflict in Iran.