I think scottyvt4 is correct- you might be getting the "Mission failed- took too long" message because the planes you need to escort are being shot down. After all, it is an escort mission, so how is it possible to actually take too long to escort a plane? It must be because it's getting shot down.
As he said, simply find the planes marked with the blue triangles and shoot down the 109's that are attacking them that are marked in red.
Also, what difficulty are you on?
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