Out of interest, for how long has that situation now been the case?
I think since TPE services started running from Piccadilly. Prior to that there were North Wales to Yorkshire services via Victoria.
Under FNW there was a Chester-Warrington-Manchester-Stockport-Chester working and a Chester-Altrincham-Manchester-Warrington-Llandudno working in the morning peak to prevent the need for reversals, which even continued after the Manchester-North Wales services transferred to the Wales & Border franchise. The latter meant most Manchester commuters from the Mid-Cheshire line with 9am starts got to travel in to work on a 175.
Between the Altrincham-Manchester line being converted to Metrolink and the mid to late 90s there was an hourly Southport-Piccadilly-Altrincham-Chester service to prevent Southport services needing to reverse at Piccadilly and of course the Blackpool-Piccadilly-Buxton service which existed until 2008.
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Of course a few of the Blackpools are still portion workings, with a portion to/from Barrow or Windermere detaching/attaching at Preston. These extend the directly served airport catchment to include the 2% from Cumbria as well as the 1% from Blackpool. However, since the TPE 170 debacle more Cumbria services terminate at Preston, with passengers having to change to an ex-Blackpool double 156 at Preston.
I was also thinking what's in the ITT for the next franchises which specifies hourly Airport to Scotland services, hourly Airport to Blackpool services, 8tpd between Barrow and the Airport and 2tpd between Windermere and the Airport. That's a lot of Airport provision for 3% of demand.
Is it really fair for York and Middlesbrough each to keep 1tph direct to the Airport, rather than N Wales and Chester, which provide more Airport-bound passengers, getting one of the paths? Pending the Ordsall Chord, the TPE North services have to cross the Fasts between Piccadilly and Slade Lane, conflicting with Stockport line services, whereas an ATW service would stay on the Slows.
In the case of York it of course gets 2tph by the time the Middlesbrough train stops there.
It would be interesting to see a more detailed breakdown of the 7% from Cheshire. Presumably they don't all come from the Wilmslow and Crewe areas even if those are the only two areas currently with proper public transport links to the Airport.