NEW : At least 1 killed in airport clash between troops , Zelaya supporters . Deposed President Jose Manuel Zelaya says he 's been denied permission to land . Score: 6 Zelaya to go to neighboring El Salvador .
NEW : At least 1 killed in airport clash between troops , Zelaya supporters . Deposed President Jose Manuel Zelaya says he 's been denied permission to land . Leftist leader ousted in a military coup tried to return to Honduras . Zelaya to go to neighboring El Salvador .