the reason for the 70/90 vacancy bid is that they figure on losing the top 70 FO's in the captains vacancy bid.
Reserve on the 70 will just depend on your seniority number. I had a wopping 9 days of reserve and have a line in Feb. The 70 is soooo much nicer. No fighting to get your bag in that stupid compartment, never have to check the oil. You can walk under the wing without having to get on your Knees. One word FADEC! Auto Bleeds, don't mess with the pacs etc.
And the FO even has his/her own hat rack!!!!
