Sentence Correction (SC) | Re: There is a practical unlimited number of air routes

There is apractical unlimited number of air routes, but they are denser over the North Atlantic, inside North America and Europe and over the North Pacific.

1) practical unlimited number of air routes, but they are denser over

2) practically unlimited number of air routes, but they are dense over

3) practical unlimited number of air routes, which are denser over

4) practical unlimited number of air routes, but they are dense over

5) practically unlimited number of air routes, but they