Hey mate your problem is that the runway in riga is only 2 550 meter long and your 747-100 needs 2 870 m to go up full loaded.Beside that flying a 747 on such a short route is very expensive.
Well, actually, now Riga (EVRA, RIX) is now able to land B747-100. Real-time r/w length is approz. 3200 m.
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