At this time it is awkward to recruit any non EC nationals due to the very strict regs applied by Canada & the USA. Not totally accurate but in effect if Crew are not EC or other states with right of entry or another passport holder but with right of abode (or similar) they will not be permitted to enter. BA have in the recent past had a number or crews rejected. As you can appreciate it is a logistical nightmare to recruit lomghaul and then exclude them from various services.