Same issue here. And the reason I find it frustrating is less attributed to availability of online access on my end, and more that I have been causing crashes in the more recent Tekkit packs on a near-daily basis. Said crashes are session enders if I booted the pack online in order to play offline.
I tried logging in with my old Mojang account, but I'm not sure if that's possible now that I seem to have purged what was left of it from the Technic record.
So, I guess we might have slight strength in numbers...?