I was planning a couple of trips and came across a leg on US that included one of the new Embraer 170s. It was listed on USAir's website as a mainline flight and what appears to be a mainline flight number (1624 or something like that). Is Mid-Atlantic Airways dead (isn't that who was going to be flying the 170s)? Anybody know if mainline pilots are being trained to fly these? Just curious.