7/19/15 is immediately and irredeemably ugly to me, because I'm not in the U.S. Quick, someone from Europe types in 9/10/15, do they want to travel in September or October?
If finding flights is a case of search, then we can look at Google. It uses text to maximize expressiveness. It uses progressive refinement rather than precise query to produce better results, e.g. maps results based on partial addresses. Google is understands that search has intrinsic ambiguity and that natural language is the best tool we have for dealing with it...and the hieroglyphs are not.