Personally, I have not flown them, but the best thing about them is that you are flying into Luxembourg City Airport, about five miles from downtown Luxembourg City. For those who are bargain hunters, LUX is usually less crowded than either LHR or FRA, and a lot less expensive in the off-season. The main train station in Lux City offers easy connection and train service to most of Europe.
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AlphaSigOU
Causa latet vis est notissima - the cause is hidden, the results are well-known.