Get a free alert the moment an interview slot opens at Ontario Airport (California) in Ontario, CA. Haya checks the official CBP scheduler every 5 minutes, around the clock.
Cancellations free up interview slots all the time — they're just gone within minutes. Haya watches Ontario Airport (California) for you and emails you the moment one appears, so you can book it at ttp.cbp.dhs.gov before it's taken. Email alerts are free; push and SMS alerts for near-term slots are on Pro.