how do u beat this part in halo 3?

[tommy g]

the part were the objective is breach the citidel and there are 2 spider things??
i can blow up one but than i cant get into the other one...
how do i get on/in the other
when i get in the hornet and try to fly around the spider it just turns in circles with me

 

[ACExSHOVELEDxU]

u have to blow up the 2 spider things and then u will be able to get inside the citadel

 

[archy]

shoot the spiders in the legs with the plane you have kill the covenant in the spider using your plane so you don't waste ammo and then after you clear up the people inside and you knock the spiders down then go inside of them and destroy their power core.