Well, only the difference in taxes actually.
I was recently in need of a flight from Kilimanjaro where I was on safari as well as climbing the mountain, to Brussels, Belgium where I was planning to attend Tomorrowland. Posts on those trips to follow. The cost to flight that route in business class on Star Alliance is 52,000 Singapore miles, which is the lowest easily obtainable currency. I searched for availability and could only find reasonable flights for my date, with the last inter-Europe segment in economy. The routing was JRO-ADD-MXP-BRU, so I figured a short 1 hour leg in economy wouldn’t be too bad.