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Ingest daily data, but delivery is always delayed by two days

A lot of our dags are ingesting data (usually daily or weekly) from suppliers, and they are universally late.

In the case I'm setting up now the delivery lag is about 30hours - data for 2018-10-10 turned up at 2018-10-12 05:43.

I was going to just set this up with an S3KeySensor and a daily schedule, but I'm wondering if anyone has any other bright ideas for a better way of handling this sort of case:

    dag = DAG(
        params={'country': cc}

    with dag:
        task = S3KeySensor(
            bucket_key="s3://bucket/raw/table1-{{ }}/{{ execution_date.strftime('%Y/%m/%d') }}/SUCCESS",
            poke_interval=60 * 60 * 2,
            timeout=60 * 60 * 72,

That S3 key sensor is _going_ to fail the first 18 times or so it runs which just seems silly.

One option could be to use `ds_add` or similar on the execution date, but I don't like breaking the (obvious) link between execution date and which files it picks up, so I've ruled out this option

I could use a Time(Delta)Sensor to just delay the start of the checking. I guess with the new change in master to make sensors yield their execution slots that's not a terrible plan.

Does anyone else have any other idea, including possible things we could add to Airflow itself.