As Memorial Day weekend draws closer – along with the unofficial start of summer – the time is ripe for investors to take advantage of expectations for strong travel demand. As noted by leading domestic carrier Delta Air Lines (DAL) in its latest quarterly results, neither flight scares due to the recent Boeing (BA) fiasco nor persistently high inflation have dampened demand for travel among the public. Data from Expedia (EXPE) seems to confirm those signals, with searches for summer flights up 25% year-over-year. For investors looking to benefit from this trend, here are two high-yielding rea…