-900 CA right now is VERY senior (as in seniority numbers 100 or less as of the last vacancy). When we first got them a payrate was still being arbitrated so a good number of folks went to the -900 for an easier commute or just to fly the new jet. Once rates came out pilots went there for more money. Now that there is some movement again the first few slots that have opened for -900 CA have been senior. For -900 FO it's not ridiculously senior but don't even think about holding it as a new hire.