Airport parking congestion info., show you each Japanese airport parking lot congestion informations. Also congestion forecast (experimental) is avilable.
Each airport's parking lot congestion status on Twitter

NKM Nagoya Airport

Vacancies Conguestion rate 0%
Nagoya Airport Parking lot

SHM Nanki-Shirahama Airport

Vacancies Conguestion rate 0%

HIJ Hiroshima Airport

Vacancies Conguestion rate 0%
Each airport's parking lot congestion status on Twitter