What´s next for airliner telephones?

It is projected that what´s next for airliner telephones is a phone for every seat in first class and for every row in coach. What´s next for airliner telephone reliability is the use of spreadsheet matrix inversion routines to analyze strings of phone failures and policies of dispatch with degraded redundancy. What´s next for airliner telephone maintainability is a concept of restoring some redundancy while the aircraft is being cleaned for its next day of use. It is concluded that telephone calls on an airliner will become much easier to place and that airliner availability need not decrease because of that increased phone accessibility. It is shown that circuit redundancy and dispatch policies can reduce processing unavailability to any desired level. It is demonstrated that unavailability for the added phones and repeaters can be reduced to a very `small number using idle time