United Airlines grounding flights earlier this week, due to computer malfunctions, is not slowing down many travelers. Nor are travelers deterred by the recent Department of Justice announcement that it is launching an investigation into possible collusion in the airline industry. The hotel industry is set to do well, despite Airbnb and other industry disruptors. Spending on travel and tourism increased in the first quarter of 2015 reported the Bureau of Economic Analysis, despite the anemic growth in the economy in the same period. Historically, the hospitality industry, despite its pronounced cyclical behavior, manages to grow on par with the economy long term. Here are some of the best hotels, resorts, and cruise lines TheStreet Quant Ratings says you should consider looking at. Number 4 is Interval Leisure Group. With a 'B ' rating, the company's strengths can be seen in its revenue growth and increase in net income. 3rd is, Royal Caribbean Cruises. This rating is also a 'B+.' Royal Caribbean thrives in its solid stock price performance and compelling growth in net income. 2nd is Carnival Corporation. With an 'A' rating, the company flourishes in its solid stock price performance and good cash flow from operations. Number 1 is Marriott Vacations Worldwide Corporation. With an 'A+' rating, the company's strengths can be seen in its revenue growth and solid stock price performance. TheStreet Ratings are algorithmic stock picks based on 32 major data points. S&P 500 stocks rated 'buy' yielded a 16-and-a-half-percent return in 2014, beating the S&P 500 Total Return Index by more than 300 basis points. For the full reports on these stocks, you can check out TheStreet.com/QuantRatings.