Ok. Tech, I'll accommodate you and provide a less than 100 word response to your question.
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The simple reason DL is being aggressive with NK (to whom these fares are targeted) is because there is an abundance of history that shows that network/legacy airlines that INTENTIONALLY CHOOSE not to compete with certain airlines or certain segments of the passenger base in the network carriers' KEY MARKETS have ended up with having those markets infested with low fare carriers.
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Kev is absolutely correct that there is no reason for DL to chase low fare carriers in non-core markets. AA and DL both of late have made the decision for instance that they will not chase low fare carrier traffic in BOS - and both have pulled down their offerings there.
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But DTW IS a core market for DL and they cannot allow a low fare carrier to add a flight or two in one or two core markets without attemping to be price competitive - or they will wake up one day with that carrier firmly established and offering 3-4 flights/day which is more than enough to establish in the consumer's mind that the LFC is a viable competitor.
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You need only look at what has happened to AA in the past year at ORD and DFW by B6 and VX. B6 now has more than 15% market share in BOS-ORD, a market that was long dominated by AA and UA - and most of the share has come from AA. In DFW-SFO and LAX, VX has 20% or more market share and the average fare has fallen.
AA chose NOT to be fully competitive with VX during its early months in DFW, in part because AA's flights were already full - and now there is more LFC capacity being added to DFW than in any other network carrier hub.
Or you can look at UA's DEN hub... UA chose to not be competitive with WN and FL which aggressively expanded at DEN during UA's BK - they added roundtrip/Sat night stay requirements and a $20 or more premium to WN's fares and, lo and behold, UA now has less than 30% domestic market share at DEN, is pulling down flights, and WN continues to grow.
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Any network carrier that chooses not to be competitive with other carriers in the network carrier's core markets can prepare to see those markets be taken over by the low fare carrier, with the result that the network carrier loses the ability to price its own produce and loses the brand preference they once had in that market.
The evidence that NK is hurting DL loads comes where? At the same time several posters have said that DTW-Florida flights are FULL plus?
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While comparing DL Express/Song, Metrojet, etc.... it is worth noting that DL STILL serves the majority of the markets served by those carriers AND maintains its relative position in those markets, including being the only network carrier that serves all of the key Florida markets from BOTH LGA and JFK.
Most of the metrojet markets were abandoned. UA still serves many of the same markets but as noted UA continues to decrease its presence in DEN.
DL Express/Song were mechanisms that DL used to protect its markets - and they succeeded at doing that, regardless of whether Song/DL Express still exists.
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The same might well be said about Economy Basic in a few years.
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Despite pulling down CVG and MEM over several years, DL's market share in those cities remains unchanged and even though CVG has been begging low fare carriers to enter CVG, none have chosen to do so.
WN is at the same market share in SLC as it was 10 years ago - and WN/FL will be smaller in ATL by the end of this year than they were when the WN/FL merger was announced.
DL - and NW while it existed - both had VERY AGGRESSIVE strategies to protect its core markets.
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In all the fury to find reasons why Economy Basic will fail, some people here seem to forget (or don't know) that DL, like many airlines, does not assign 100% of their seats in advance NOW. There are 10-12 people on every flight TODAY who will check in with no seat assignment.
DL, like most other airlines, already provides a mechanism for gate agents to quickly know what passengers on the flight are unseated and assign seats, including knowing whether those passengers have already checked in for an upline flight. They also clearly see families traveling with children and can assign seats......
NOTHING CHANGES from the way seat selection happens now vs. with Economy Basic, except that the EB passenger NEVER gets a chance to request what seats they want - DL makes the decision.
If anything, there will be a higher percentage of "normal" economy passengers who will be able to select their own seats in advance.
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DL is not increasing overbooking levels to sell these seats and DOT stats show that DL already has one of the lowest denied boarding ratios in the industry, esp. among network carriers - and that is due in large part to what NW invested in their revenue mgmt system - which DL chose to use over DL's own system.
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Again, if anyone actually went to delta.com to buy these seats, you would see that there are advisories that there are only a couple seats available at the EB fare - if they can be found at all. There are very limited numbers of these seats.
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Carry on baggage? Please! What makes someone who buys an EB fare any more likely to bring on carry-on baggage than other passengers? DO you not think that gate agents at ALL airlines have been well-trained in looking for and requiring oversize baggage to be checked?
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The Economy Basic fare is an obvious attempt for DL to be competitive with ultra-low fare carriers who unbundle their products. Since WN does not do that, it is unlikley they are one of the targets.
It is possible that DL will detach other product elements - including Skymiles accumulation, baggage allowances, etc - the EB fare concept at some point... but there is no reason to think that DL agents will understand EXACTLY the differences in service levels to be provided - just as they do between normal and elite passengers - who have different baggage allowances TODAY.
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I'm sure my explanation is more than some people want to read - but they were free to have clicked away from the post ealier...and since forums loads an entire post on one page (I've never seen a post divided over two pages) there was no doubt how long the post was when they started reading.
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The bottom line is that DL clearly has plans to differentiate its product in an attempt to remain price competitive with ultra low fare carriers in markets that matter to DL.
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It is no surprise that DL as the network airline that is most aggressive in competing with low fare carriers is also leading the network carriers - if not the industry in revenue growth right now.
The two strategies are not disconnected.