Start with Query

starwith

//CPT
function create_destinations() {
  $labels = array(
    'name' => _x('Destinations', 'post type general name'),
    'singular_name' => _x('Destination', 'post type singular name'),
    'add_new' => _x('Add New', 'Destination'),
    'add_new_item' => __('Add New Destination'),
    'edit_item' => __('Edit Destination'),
    'new_item' => __('New Destination'),
    'view_item' => __('View Destination'),
    'search_items' => __('Search Destinations'),
    'not_found' =>  __('No Destinations found'),
    'not_found_in_trash' => __('No Destinations found in Trash'),
    'parent_item_colon' => ''
  );

  $supports = array('title', 'editor', 'author', 'custom-fields', 'revisions', 'excerpt','thumbnail','comments');

  register_post_type( 'destination',
    array(
       'labels' => $labels,
       'public' => true,

	     'show_ui' => true, 
	     'rewrite' => array('slug' => 'destination','with_front' => FALSE),
	     'hierarchical' => true,
	     'capability_type' => 'page', 
	     'menu_position' => 5,
       'supports' => $supports,
       'taxonomies' => array('category', 'post_tag')
    )
  );  
}


//Display destination and related icon

<div id="alphabet">
                    Show: 
                    <a href="/guides?orderby=">ALL</a> |
                    <a href="/guides?orderby=A">A</a> | 
                    <a href="/guides?orderby=B">B</a> | 
etc..
</div>

<?php

$listitems = get_option('tp_listitems');
                    
$theletter = $_GET['orderby'];  
$paged = get_query_var('paged') ? get_query_var('paged') : 1;

if( !empty($theletter) ) { 
                    $args = array( 'post_type' => 'destination','paged' => $paged,  'posts_per_page' => $listitems ,'order' => 'ASC', 'orderby' => 'title', 'query' => $wp_query,'startswith'=>$theletter) ;
                    }else{
                    $args = array( 'post_type' => 'destination','paged' => $paged,'posts_per_page' => $listitems ,'order' => 'ASC', 'orderby' => 'title', 'query' => $wp_query) ;
                    }
                    
                    $temp = $wp_query;  // assign original query to temp variable for later use
                    $wp_query = null;
                    $wp_query = new WP_Query();
                    $wp_query->query($args);

                    $post_count = $wp_query->post_count; // should be the result count for the current page
                    $loop_count = 0;
                    
                    //Find connected Articles
                    p2p_type('posts_to_destinations' )->each_connected( $wp_query, array(), 'articles' ); 
                    
                    if($wp_query->have_posts()) :$curr_letter = '';while($wp_query->have_posts()) : $wp_query->the_post();
                    $loopid = $post->ID; 
                    $loop_count++;
                     $this_letter = strtoupper(substr($post->post_title,0,1));
                      if ($this_letter != $curr_letter) {
                        $curr_letter = $this_letter;
                      }
                    ?>
   
                              <div id="itemlisting">
                              <?if(has_post_thumbnail()){?>
                              <div id="itempic"><a href="<?php the_permalink(); ?>" alt="<?php the_title(); ?>"><?php the_post_thumbnail(); ?></a></div>
                              <?}?>
                            	<div id="itemheader">
                                  <div id="ititle"><h4><a href="<?php the_permalink(); ?>" id="post-<?php the_ID(); ?>"><?php the_title(); ?></a></h4></div>
                                  <div id="ioptions">
                                  <?php
                                     //Only display icon if connected articles exist
                                      if($post->articles){
                                       echo display_article_icon($post->ID);  
                                      }
                                  ?>
                                  </div>
                              </div>
                            	<div id="itemcontent"> 
                            	 <?php
                                $intro = excerpt('36');
                                $introstripped = str_replace("Overview",'',$intro);
                                echo $introstripped;
                                //echo excerpt('36');
                                ?>
                              </div>	
                            	</div>                           
                       <?php endwhile; else : ?>
                       Sorry, no destination to display.
                      <?php endif; ?>
                      <div id="navlist">
                      <?php
                      if(function_exists('wp_pagenavi')) { wp_pagenavi(); }
                      
                      ?>
                      </div>
                      <?php 
                      $wp_query = null; 
                      $wp_query = $temp; 
                      wp_reset_postdata(); 
                      wp_reset_query(); 
                      //echo $loopid;
                      ?>