From The Collaborative International Dictionary of English v.0.48 :
Overfly \O`ver*fly"\, v. t. [imp. Overflew; p. p. Overflown;
p. pr. & vb. n. Overflying.]
To cross or pass over by flight. --Byron.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
overfly
v 1: fly over; "The plane passed over Damascus" [syn: pass
over, overfly]