My airline produces tailored pages in the Jeppesen manuals specifying airway MSA's and 'escape routes' (generally lower than Chart 60nm square MSA's) which allow the aircraft to be flown i.a.w with the descent profiles within the FM.
Our Airbus can remain above FL140 for 22 min, Boeings 14min. You can remain between FL140 and FL100 for upto an additional 30 min providing you have supplimentary oxygen for at least 10% of pax (I think).
Without the tailored pages, it would be impossible for us to remain within the JAR rules, yet stay above chart MSA's in the event of a decompression at certain points along the VG81/UL223 accross Turkey and Iran.