How do I plot two ARIMA forecasted trend lines in the same graph?

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Python

graph

pred_uc1 = results.get_forecast(steps=30)
pred_ci = pred_uc1.conf_int()
axes = y.plot(label='A321 Observed', figsize=(14, 7))
pred_uc1.predicted_mean.plot(ax=axes, label='A321 Forecast')

pred_uc2 = results.get_forecast(steps=30)
pred_ci = pred_uc2.conf_int()
ax = y.plot(label='A320 Observed', figsize=(14, 7))
pred_uc2.predicted_mean.plot(ax=ax, label='A320 Forecast')
ax.fill_between(pred_ci.index,
                pred_ci.iloc[:, 0],
                pred_ci.iloc[:, 1], color='k', alpha=.25)
ax.set_xlabel('Date')
ax.set_ylabel('Down Days')
plt.legend()
plt.show()

What I have tried:

I've tried the above code and it gives me just one trend line when it should be plotting two trendiness, one for each aircraft