src/main/java/com/passkit/grpc/Flights/PassengerOuterClass.java
public Builder clearIssuingCountry() {
        
        issuingCountry_ = getDefaultInstance().getIssuingCountry();
        onChanged();
        return this;
      }
/**
       * <pre>
       * The two digit ISO 3166 country code of the country of the travel document issuing authority.
       * </pre>
       *
       * <code>string issuingCountry = 2;</code>
       * @return This builder for chaining.
       */

The two digit ISO 3166 country code of the country of the travel document issuing authority.

string issuingCountry = 2;
@return This builder for chaining.
The two digit ISO 3166 country code of the country of the travel document issuing authority . string issuingCountry = 2 ; @return This builder for chaining .
public Builder clearIssuingCountry() {
        issuingCountry_ = getDefaultInstance().getIssuingCountry();
        onChanged();
        return this;
      }
public Builder clearIssuingCountry ( ) { issuingCountry_ = getDefaultInstance ( ) . getIssuingCountry ( ) ; onChanged ( ) ; return this ; }
<pre>
 The two digit ISO 3166 country code of the country of the travel document issuing authority.
<pre > The two digit ISO 3166 country code of the country of the travel document issuing authority .