Remarketing is drastically underutilized, not only by travel agencies, but by online businesses as a whole. You have far more control over the type of visitors to whom want to show your ad based off of keywords. You’ll be able to target more qualified users that are already familiar with your website. This is really good for agencies that have a smaller search ad budget to get started with search ads.
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Everything You Need to Know About Remarketing Lists for Search Ads (RLSA)