Originally Posted by
cmd320
On a side note, it also seems like the doors on Delta's A321s are designed differently than the ones on AA's A321s. On AA there's an arming lever to activate/deactivate the slide. Delta's seem to have some kind of pin and string.
At least the ex-US Airways ones are, I believe, "permanently" armed at doors 2/3 (hence the big lever in the down position with "ARMED" printed across it). While there is usually no access to door 2/3 anyway for boarding/service trucks, it may be an option (I've seen Lufthansa get a jet bridge up to door 2 - I believe the jetway has to be specially equipped so as not to come too close to the engine). The pin and ribbon with "remove before flight" is the standard Airbus setup for the arming lever, and would be found on doors 1 and 4.