Create OF airport for routes with a "\N" airport in routes.dat

Whoah, there's a lot more of these than I expected.

cat data/routes.dat | awk -F , '{print $3,$4}' | grep '\\N' | sort | uniq

ABB \N
ACZ \N
AOG \N
AOQ \N
AVA \N
BNB \N
BNC \N
BPL \N
BTC \N
BUL \N
BUW \N
CBS \N
CFK \N
CKX \N
DCN \N
DEF \N
DHB \N
DOB \N
DQA \N
DRV \N
EBH \N
EDA \N
EKS \N
ERL \N
ETR \N
FVM \N
GCH \N
GLN \N
GMO \N
HOE \N
IAO \N
IKE \N
INB \N
IOQ \N
IOT \N
IUI \N
IWK \N
JAU \N
JIC \N
JJA \N
JKR \N
JUH \N
JUK \N
JUU \N
KAA \N
KAZ \N
KCG \N
KCK \N
KCO \N
KGQ \N
KHQ \N
KHY \N
KHZ \N
KKI \N
KOO \N
KQT \N
KSE \N
KUZ \N
KWF \N
KXU \N
LDS \N
LFM \N
LLB \N
LMA \N
MBI \N
MEU \N
MHC \N
MNA \N
MNS \N
MQJ \N
MZW \N
NER \N
NGK \N
NIQ \N
NKI \N
NLT \N
NOP \N
NSQ \N
OGD \N
OGM \N
OKL \N
OLL \N
ORU \N
ORZ \N
OSM \N
OUZ \N
PBZ \N
PHB \N
PKA \N
PQM \N
QFG \N
QFN \N
QJH \N
QOQ \N
QUO \N
QUV \N
QUW \N
RCY \N
RKA \N
SAE \N
SGG \N
SQS \N
SRK \N
SUK \N
SVK \N
SVR \N
SVS \N
SXI \N
SXK \N
SZE \N
SZI \N
TBI \N
TCR \N
TGI \N
TGK \N
TGP \N
THX \N
TKJ \N
TNW \N
TQA \N
TQI \N
TQL \N
TZL \N
UGB \N
ULZ \N
UPK \N
UTS \N
VLY \N
WAE \N
WNA \N
XEQ \N
YFJ \N
YIE \N
YKT \N
YNP \N
ZBL \N
ZGS \N
ZQZ \N
ZYI \N

I'll need to see if I can pull these programmatically from OurAirports or something.

jpatokal / openflights

Create OF airport for routes with a "\N" airport in routes.dat #337