When using the single airline filter airlines with very few cancellations in the time_period are being unintentionally truncated from the list. As a temporary work-around a higher howMany can be set when making the single airline query. A value of 75 will normally force the result so long as there is actually a cancellation reported for the airline. This will not change the query cost since it will still only return a single result so long as an airline is specified in the ident_filter.